Seismic Installation Manual

Seismic Installation Manual

This manual provides the design strength capacities and installation guidelines for the Bracing System for use in the design of an overall bracing system for suspended nonstructural components, equipment, and systems. 2

Contents / Page Number Section 1: Introduction 1.1 Scope 4 1.2 Kit Contents 5 1.3 System Strengths 6 1.4 Description of Bracing Assemblies 1.4.1 Transverse 7 1.4.2 Longitudinal 8 1.4.3 4-Way 9 1.5 Brace Spacing Guidelines 10-12 1.6 Bracing System Design Guidelines 13 Section 2: Seismic Bracing Kit and Components Overview 2.1 Kit Contents 14 2.2 Eyelet & Fastener 15 2.3 Brackets 16 Section 3: Seismic Brace Installation 3.1 Basic Brace Layout 17 3.2 Seismic Fastener Installation 18 3.3 Seismic Bracket Installation 3.3.1 Retrofi t Bracket Installation 19 3.3.2 Bracket Stacking Installation 20 3.4 Support Rod Stiffeners 21 Section 4: Brace Anchor/Attachment Installation 4.1 Basic Guidelines for Concrete Structures 4.1.1 Concrete Wall 22 4.1.2 Concrete Ceiling/Roof 23 4.1.3 Concrete Over Metal Decking 24-26 4.1.4 Concrete Block Wall 27 4.2 Steel Beam 28 4.3 Bar Joists 4.3.1 Transverse or Longitudinal 29 4.3.2 4-Way 30 4.4 Steel Beams 31 4.5 Timber Members 32 4.6 Attachment Design 4.6.1 Selected Structural Attachment Design Strengths 33 4.6.2 Normal Weight Concrete 34 4.6.3 Concrete-Filled Metal Deck 35 4.6.4 Concrete Block 36 4.6.5 Unistrut Beam Clamp Attachment 37 4.6.6 Anchor Prying Effects 38 Section 5: Bracing Layout Guide 5.1 Round Ductwork 5.1.1 Transverse 39 5.1.2 Longitudinal 40 5.1.3 4-Way 41 5.2 Rectangular Ductwork 5.2.1 Transverse 42 5.2.2 Longitudinal 43 5.2.3 4 Way 44 5.3 Flat or Oval Ductwork 5.3.1 Transverse 45 5.3.2 Longitudinal 46 5.3.3 4-Way 47 5.4 Un-Insulated Pipe & Conduit 5.4.1 Transverse 48 5.4.2 Longitudinal 49 5.4.3 4-Way 50 5.5 Insulated Pipe & Conduit 5.5.1 Transverse 51 5.5.2 Longitudinal 52 5.5.3 4-Way 53 5.6 Trapeze Supported Piping or Conduit 5.6.1 Transverse 54 5.6.2 Longitudinal 55 5.6.3 4-Way 56 5.7 Electrical Cable/Ladder/Basket Tray SIGNATURE REQ D 5.7.1 Transverse 57 Todd R Hawkinson Professional Engineer 5.7.2 Longitudinal 58 5.7.3 4-Way 59 5.8 Rectangular Units of Equipment 5.8.1 DATE: 4-Way 60 XX/XX/2009 5.8.2 Linear 4-Way 61 3

1.1 Introduction / Scope Bracing Systems are specifi cally designed and engineered to brace and secure nonstructural equipment and components within a building or structure to minimize earthquake damage to suspended components. Bracing systems are ideal for use on nonstructural components and equipment requiring seismic design, such as in essential facilities that are required for emergency operations in the aftermath of an earthquake. Detailed in this manual are bracing design and installation guidelines for a variety of nonstructural components, equipment, and systems. Actual bracing requirements for some sites may vary from these guidelines, and these site-specifi c bracing installations are not limited to the guidelines detailed here. However, any deviations from the guidelines within this manual may be pre-approved by the seismic engineer of record for the particular site. It is the responsibility of the reader and structural engineer for the project/site to ensure that the existing structure is capable of withstanding the full loads that may be induced by the braced equipment or Seismic attachments. The services of a seismic bracing engineer or a professional/structural engineer is required to determine the seismic demand forces, required bracing, spacing, and anchorage attachment of the bracing to the structure in accordance with these guidelines and applicable building code design provisions and conditions for the project. Please note that this manual does not replace code-required industry standard practices. Bracing systems, designed as per the guidelines outlined in this manual, do not guarantee adequacy of the installation, and it is the responsibility of the reader and structural engineer for the site/project to ensure the adequacy of the design and placement of the Seismic bracing kits and their installation to be in compliance with the applicable codes. Michael J. Griffin Professional Engineer California No. 38184 DATE 3/25/11. Disclaimer: Neither Michael J. Griffi n nor Gripple are the Structural or Professional Engineers of Record. The stability and adequacy of the structural elements, nonstructural components or seismic sway braces, hangers, brackets, bolting, anchorage and any other required attachments are the responsibility of the Structural or Professional Engineer of Record, or the seismic bracing design engineer for the Facility or Project. Any additional or supplementary members required to ensure the adequacy or stability of the structures the seismic sway bracing attaches to are not within the scope of this manual/document. Gripple warrants that the Bracing Systems will achieve the applicable design strengths published if installed in accordance with the guidelines contained in this manual. Gripple disclaims any and all other express or implied warranties of fi tness for any general or particular application. Anyone making use of this manual does so at their own risk, and assumes any and all liability resulting from such use. 4

1.2 Introduction / Kit Contents Gripple Seismic Kit Size Length Seismic Bracket Rod/Structural Attachment Size Product Code GS12 Max Load: 860 lbs * 1.5:1 SF 10ft 15ft 20ft Standard Retrofit Standard Retrofit Standard Retrofit 3/8 1/2 3/8 1/2 3/8 1/2 3/8 1/2 3/8 1/2 3/8 1/2 GS12-10E4-S4 GS12-10S5-S5 GS12-10E4-R4 GS12-10S5-R5 GS12-15E4-S4 GS12-15S5-S5 GS12-15E4-R4 GS12-15S5-R5 GS12-20E4-S4 GS12-20S5-S5 GS12-20E4-R4 GS12-20S5-R5 Range of Sizes GS12 Max Load: 860 lbs GS19 Max Load: 2,220 lbs GS25 Max Load: 3,850 lbs GS19 Max Load: 2,220 lbs * 1.5:1 SF 10ft 15ft 20ft Standard Retrofit Standard Retrofit Standard Retrofit 3/8 1/2 5/8 3/8 1/2 5/8 3/8 1/2 5/8 3/8 1/2 5/8 3/8 1/2 5/8 3/8 1/2 5/8 GS19-10S4-S4 GS19-10S5-S5 GS19-10S6-S6 GS19-10S4-R4 GS19-10S5-R5 GS19-10S6-R6 GS19-15S4-S4 GS19-15S5-S5 GS19-15S6-S6 GS19-15S4-R4 GS19-15S5-R5 GS19-15S6-R6 GS19-20S4-S4 GS19-20S5-S5 GS19-20S6-S6 GS19-20S4-R4 GS19-20S5-R5 GS19-20S6-R6 Understanding Gripple Seismic Codes Cable Size GS12=1/8 GS19=3/16 GS25=1/4 End Fitting E=45º Eyelet S=Standard Single Bracket DS=Standard Double Bracket Hole Size in Loose Brackets 4=3/8 5=1/2 6=5/8 8=3/4 10=1 GS12-10E4-S4 GS25 Max Load: 3,850 lbs * 1.5:1 SF 10ft 15ft 20ft Standard Retrofit Standard Retrofit Standard Retrofit * System Design Strength (LRFD) values 5/8 3/4 1 5/8 3/4 1 5/8 3/4 1 5/8 3/4 1 5/8 3/4 1 5/8 3/4 1 GS25-10DS6-DS6 GS25-10DS8-DS8 GS25-10DS10-DS10 GS25-10DS6-DR6 GS25-10DS8-DR8 GS25-10DS10-DR10 GS25-15DS6-DS6 GS25-15DS8-DS8 GS25-15DS10-DS10 GS25-15DS6-DR6 GS25-15DS8-DR8 GS25-15DS10-DR10 GS25-20DS6-DS6 GS25-20DS8-DS8 GS25-20DS10-DS10 GS25-20DS6-DR6 GS25-20DS8-DR8 GS25-20DS10-DR10 Cable Length 10, 15 or 20ft Hole Size in End Fitting 4=3/8 5=1/2 6=5/8 8=3/4 10=1 Style of Loose Bracket S=Standard Bracket R=Retrofit Bracket DS=Double Standard Bracket DR=Double Retrofit Bracket (Double Brackets for GS25 only) 5

1.3 Introduction / System Strengths Hanger rod with stiffener See Section 3 Break strength certifi ed, pre-stretched Gripple Seismic cable brace Anchorage to structure See Section 4 See Section 3 for end bracket installation Attachment to equipment See Section 5 See Section 3 for end bracket installation A = 30º - 60º F h fastener See Section 3 for installation Brace Size Cable Diameter Max System Design Strength* Max Horizontal Force (F h ) @ A = 30º Max Horizontal Force (F h ) @ A = 45º Max Horizontal Force (F h ) @ A = 60º GS12 1/8 860 lbs 745 lbs 608 lbs 430 lbs GS19 3/16 2,220 lbs 1,923 lbs 1,570 lbs 1,110 lbs GS25 1/4 3,850 lbs 3,334 lbs 2,722 lbs 1,925 lbs * Max design strength (LRFD), based on 1.5:1 Safety Factor as per ASCE 19-96 and 2009 IBC Section 2207.2 paragraph 2 and 2010 CBC Section 2207A.2 paragraph 2. Based on the lowest average failure load from tension tests of the Gripple bracing components (cable, brackets, and fasteners). 6

1.4.1 Introduction / Transverse Brace Assembly 30º- 60º 30º- 60º Run direction Anchorage to structure Hanger rod with stiffener Anchorage to structure Break strength certified, pre-stretched Gripple Seismic cable brace 30º- 60º Fastener See Section 3 for Installation Fh End View Transverse bracing acts to resist the seismic forces in a plane perpendicular to the run of braced piping, conduit, ductwork or equipment, as shown above. The seismic forces that a transverse brace resists are illustrated by F h. A vertical force can be generated during a seismic event and as such, rod stiffeners may be required to help prevent the hanger rod from buckling under this upwards force. Ductile Braced Components: For piping, conduit, and equipment connections manufactured from ductile materials, the maximum allowable brace spacing for transverse bracing is typically 40ft; this brace spacing is dependent on pipe size, seismic forces, and brace components selected. Non-ductile Braced Components: For piping, conduit, and equipment connections manufactured from non-ductile materials, the maximum allowable brace spacing for transverse bracing is typically 20ft; this brace spacing is dependent on pipe size, seismic forces, and brace components selected. Refer to Section 1.5 for spacing guidelines. OVAL ENDING 7

1.4.2 Introduction / Longitudinal Brace Assembly 30º- 60º 30º- 60º Anchorage to structure Run direction Hanger rod with stiffener Anchorage to structure 30 O -60 O Break strength certified, pre-stretched Gripple Seismic cable brace fastener See Section 3 for Installation F h Side View Longitudinal bracing acts to resist the seismic forces in a plane parallel to the run of braced piping, conduit, ductwork or equipment, as shown above. The seismic forces that a longitudinal brace resists are illustrated by F h. A vertical force can be generated during a seismic event and as such, rod stiffeners may be required to help prevent the hanger rod from buckling under this upwards force. Ductile Braced Components: For piping, conduit, and equipment connections manufactured from ductile materials, the maximum allowable brace spacing for longitudinal bracing is typically 80ft; this brace spacing is dependent on pipe size, seismic forces, and brace components selected. Non-ductile Braced Components: For piping, conduit, and equipment connections manufactured from non-ductile materials, the maximum allowable brace spacing for longitudinal bracing is typically 40ft; this brace spacing is dependent on pipe size, seismic forces, and brace components selected. Refer to Section 1.5 for spacing guidelines. 8

1.4.3 Introduction / 4-Way Brace Assembly 40º - 50º Hanger rod with stiffener Run direction 30º- 60º Anchorage to structure Anchorage to structure F h Anchorage to structure Top View Anchorage to structure 4-Way bracing acts to resist the seismic forces of the run of braced piping, conduit, ductwork or equipment, in both the transverse and longitudinal directions, as shown above. The seismic forces that a 4-Way brace resists are illustrated by F h. A vertical force can be generated during a seismic event and as such, rod stiffeners may be required to help prevent the hanger rod from buckling under this upwards force. Ductile Braced Components: For piping, conduit, and equipment connections manufactured from ductile materials, the maximum allowable brace spacing for 4-Way bracing is typically limited to 80ft, so long as transverse bracing is used in addition, every 40ft; this brace spacing is dependent on pipe size, seismic forces, and brace components selected. Non-ductile Braced Components: For piping, conduit, and equipment connections manufactured from non-ductile materials, the maximum allowable brace spacing for 4-Way bracing is typically limited to 40ft, so long as transverse bracing is used in addition, every 20ft; this brace spacing is dependent on pipe size, seismic forces, and brace components selected. Refer to Section 1.5 for spacing guidelines. O AL ENDING 9

1.5 Introduction / Brace Spacing Guidelines Bracing must be installed on the vertical support system comprised of threaded rod (all-thread rod) hanger suspensions, or directly to a suspended individual equipment component. Seismic bracing shall be designed in accordance with: - the guidelines contained in this manual - the applicable building code or local city/county code requirements for seismic design. - the engineering drawings and specifi cations of the specifi c project requirements. Component hanger spacing will typically be less than the required spacing of the seismic braces. Typical maximum allowable brace spacing limits The maximum allowable brace spacing for piping/conduit/ductwork constructed of ductile materials (e.g. steel, copper, aluminum) are typically: - 40ft for transverse bracing (piping larger than 2½ dia, general conduit and ductwork) - 80ft for longitudinal bracing (piping larger than 2½, general conduit and ductwork) - 30ft for transverse bracing (piping smaller than 2½ dia) - 60ft for longitudinal bracing (piping smaller than 2½ dia) The maximum allowable brace spacing limits for piping/conduit/ductwork constructed of non-ductile materials (e.g. cast iron, plastic) are: - 20ft for transverse bracing - 40ft for longitudinal bracing The brace spacing could be considerably less than this for a specifi c run, depending on the seismic demand loads, the size and load capacity of the cable brace system used, and the strength of the structural members/components and structural anchors which resist the resulting seismic brace forces. Reduced spacing may also be required to prevent: - collisions between the piping/conduit/ductwork/equipment and other non-structural components. - rupture/shearing/slippage of fl exible joints between piping/conduit/ductwork and fl oor/ceiling mounted equipment. Brace size and spacing should not vary considerably during a run to ensure uniform defl ection of the piping/conduit/ductwork along the run, and uniform loading of the individual braces during a seismic event. 1. Transverse Maximum longitudinal spacing 4-Way Maximum transverse spacing Less than 24 Transverse bracing can be used as longitudinal bracing for an adjacent run (at 90º changes of direction) where the brace is located less than 24 from the change in direction. Longitudinal/Transverse sway bracing shall also be required within 24 of every fl exible coupling due to differential movement of the pipe or conduit. Maximum transverse spacing 10

1.5 Introduction / Brace Spacing Guidelines (continued) 2. Transverse Maximum transverse spacing 4-Way Piping/conduit/duct run may be considered a continuous run if the horizontal offset is less than 24. Otherwise, if the offset is greater than 24, each straight segment shall be treated as an independent run and appropriately braced. Offset less than 24 3. Transverse Maximum transverse spacing Less than 24 4-Way 1. The minimum bracing required for runs longer than 5ft is a transverse brace at each end, and a longitudinal brace at one of these two positions. This bracing could be sourced using points 1 and 2 above. Less than 24 2. More than 5ft but less than transverse spacing Maximum transverse spacing P OVAL N I G 11

1.5 Introduction / Brace Spacing Guidelines (continued) 4. Max transverse spacing Less than 24 max Transverse 4-Way Vertical runs must have both transverse and longitudinal bracing, or a 4-Way brace at each end of the vertical run. These bracing points must be located within 24 of the end of the vertical run, away from the change in direction. 4-way braces shall be provided at the top and bottom of all pipe risers exceeding 3ft in length. Less than 24 max Less than 24 max 4-Way braces required if vertical run exceeds 3ft Less than 24 max Max transverse spacing 5. Maximum transverse spacing Maximum transverse spacing 4-Way braced equipment Transverse Less than 24 4-Way Each unit of equipment connected to a run of piping/conduit/ductwork should be individually and independently braced. If rigidly connected to the piping/conduit/ductwork, then the equipment bracing shall also be designed for the tributary piping/ conduit/ductwork seismic forces. If the piping/conduit/ductwork is not rigidly connected, i.e. fl ex joints, then the equipment bracing cannot be used to brace the adjacent piping/conduit/ductwork and shall be independently braced. Suspended rectangular units of equipment shall be provided with a minimum of one sway brace at each corner (4 total braces). See Section 5 for details. 12

1.6 Introduction / Bracing System Design Guidelines The following provides the general process in designing seismic component bracing using the Bracing System. 1. Determine the routing of the distribution system (HVAC duct, cable tray, conduit, etc.) or the location of the suspended component designing the appropriate vertical supports and spacing. 2. Calculate the seismic brace forces using the provisions of ASCE 7 chapter 13. Parameters required for this calculation include the seismic weight of the component, seismic brace layout (transverse and longitudinal) and spacing, spectral acceleration (S DS ), component importance factor, a P & R P factors, and elevation in the building structure. 3. Select the appropriate Gripple seismic cable brace system based on strength capacities (Section 1.3). Determine required attachments for installed condition (eyelet, standard bracket, retrofi t bracket, etc.). 4. Resolve brace force into component forces (tension & shear) at anchor attachment to the structure. Apply appropriate prying factor from Section 4 to anchor demands. 5. Select the desired structural attachment and determine the appropriate anchor capacity from Section 4. 6. Compare anchor demands (Step 4) and anchor capacities (Step 5) to determine adequacy of selected anchor for the structural attachment. 7. Calculate forces on threaded rod and compare with capacity in Section 3 to determine adequacy of rod and rod stiffener requirements. 8. Engineer of record for the building structure shall verify that the structure can support the component weight and resist the calculated seismic forces at the structure attachment points from the non-structural component. 13

2.1 Seismic Bracing Kit and Components Overview / Kit Contents 1 3 4 2 5 1. Cable Break strength certifi ed, pre-stretched cable. Available in lengths of 10ft, 15ft and 20ft. 2. Color Coded Tags Pre-assembled color coded tags for easy fi eld verifi cation of cable diameter. GS-12 Green; GS-19 Yellow; GS-25 Purple 3. End Fitting E-45º Eyelet S-Standard Single Bracket* DS-Standard Double Bracket* Eyelet Standard Bracket Double Bracket 4. Fastener GS12 - Max Load 860 lbs GS19 - Max Load 2,450 lbs GS25 - Max Load 4,100 lbs Green Yellow Purple 5. Loose bracket Standard Bracket or Retrofi t Bracket as Single or Double Brackets. Standard Bracket Retrofit Bracket * Zinc plated copper ferrules 14

2.2 Seismic Bracing Kit and Components Overview / Eyelet & Fastener Gripple Eyelet C E 45º A D B Eyelet Size GSE4 A 1 Dimensions B C ø 1 29/ 32 53/64 D ø 7/16 E 1/8 Fastener B C A Brace Size A Dimensions B C Cable Construction Lowest System Component Break Strengths Max System Design Strength (Safety factor 1.5:1) GS12 (1/8 cable) 1 9/64 3 1/4 35/64 7 x 7 1,278 lbs 860 lbs GS19 (3/16 cable) 1 11/32 3 3/4 9/16 7 x 19 3,322 lbs 2,220 lbs GS25 (1/4 cable) 1 23/32 4 21/32 11/16 7 x 19 5,740 lbs 3,850 lbs 15

2.3 Seismic Bracing Kit and Components Overview / Brackets Standard Bracket E 45º A Code will vary according to hole size D B C Standard Bracket Size GSS4 GSS5 GSS6 GSS8 GSS10 A 25/32 13/16 13/16 1 1 1/16 B 1 9/16 1 9/16 1 9/16 1 31/32 1 31/32 Dimensions C ø 1 9/16 1 21/32 1 21/32 1 31/32 1 31/32 D ø 7/16 9/16 11/16 13/16 1 1/8 E 5/32 5/32 5/32 5/32 5/32 Retrofit Bracket 45º G D A B Code will vary according to hole size E Retrofit Bracket Size GSR4 GSR5 GSR6 GSR8 GSR10 A 3 45/64 3 3/4 3 3/4 4 9/64 4 9/16 B 2 9/16 4 5/8 4 5/8 3 1/16 3 5/16 C 1 31/32 1 31/32 1 31/32 2 1/4 2 7/16 C Dimensions D 7/16 9/16 11/16 13/16 1 1/8 F E 1 1/16 1 5/16 1 5/16 1 13/32 1 17/32 F 45/64 45/64 45/64 55/64 29/32 G 1/4 1/4 1/4 1/4 1/4 16

3.1 Seismic Brace Installation / Basic Brace Layout Attachment to structure Gripple cable end fi tting (GSE or GSS bracket); Anchorage by others See Section 4 Break strength certifi ed, pre-stretched Gripple Seismic Cable Fastener (GS12, GS19, GS25) Color tag Hanger rod with stiffener See Section 3.4 30º - 60º Attachment to equipment/strut Gripple GSS or GSR Bracket Strut 17

3.2 Seismic Brace Installation / Seismic Fastener Installation 1. 2. 1. Thread the tail end of the cable through the first channel of the Fastener. 2. Thread the cable through the hole of the Bracket 3. 4. X 3. Thread the cable back through the second channel of the Gripple Fastener. A 2 tail is recommended for any future adjustments. Hand-tighten cable to remove all slack. For spring isolated equipment, leave 1/8 visible sag in the cable. 4. Hand-tighten the locking bolts until tight. Installation of the Brace is complete. 18

3.3.1 Seismic Brace Installation / Retrofi t Bracket Installation Retrofit Bracket Installation 1. 2. 3. 1. Loosen nut and washer. 2. Attach Retrofi t Bracket in direction of cable brace. 3. Tighten down nut on top of the Retrofi t Bracket. Double stacking for GS25 Kit Note: When using GS25 the attachment to the braced equipment must use double stacked Retrofi t Brackets. Hanger rod with stiffener (see Section 3.4) GS25 to structure attachment X To GS25 brace 19

3.3.2 Seismic Bracing Installation / Bracket Stacking Installation Typical bracket installation for Transverse bracing Hanger rod with stiffener (see Section 3.4) Note: When using GS25 brackets, they must be double stacked (see Section 3.3.1) To brace Strut Typical stacking for Longitudinal bracing Hanger rod with stiffener (see Section 3.4) To brace Strut To brace Typical stacking for 4-Way bracing To brace Hanger rod with stiffener (see Section 3.4) 40º - 50º 40º - 50º Strut To brace 20

3.4 Seismic Bracing Installation / Support Rod Stiffeners All-Thread Hanger Rods Tensile capacities of all-thread hanger rods are provided in the table below. Rod Diameter (in.) 3/8 1/2 5/8 3/4 Design Strength for All-Thread Rod Tensile Strength (lbs) 860 1,595 2,560 3,825 1. Design strengths reproduced from Unistrut Seismic Bracing Catalog, SBS-3. Approved by OSHPD. 2. Allowable loads converted to design strengths using a factor of 1.414 3. Structure attachment of the all-thread rod may have a lower capacity. 4. See figure below for rod stiffener guidance when rod hanger length exceeds these maximum values. 1, 2, 3 Max Rod Buckling Strength 4 (in.) 19 25 31 37 Rod Stiffeners At cable brace support locations, the hanger rod support(s) will be placed in compression due to the seismic forces of the cable bracing system. The table above provides permissible maximum rod lengths to prevent rod buckling. Rod hanger lengths exceeding these maximum values require stiffening in accordance with the fi gure below. Rod hanger support stiffener requirements 21

4.1.1 Brace Anchor/Attachment Installation / Concrete Wall 1. Anchor design shall be in accordance with the applicable building code seismic design provisions. Typically this will include compliance with ACI318, Appendix D. See Section 4.6 for Attachment Design Strengths. 2. Refer to applicable International Code Council evaluation service reports (ICC-ES) for each specifi c anchor. 3. All non-gripple parts, rod hangers, support products and connectors shall be approved for seismic applications where required, and shall be designed by a licensed professional engineer responsible for the design. 4. Use caution when drilling or anchoring into a concrete wall, that the anchor embedment does not exceed the minimum required wall width as established by the anchor manufacturer. 5. When using GS25, two double standard brackets must be used (see Section 3.3.1.). 6. Building structure at anchor locations must be point load capable. Verify loading with structural engineer for the site/project. 1. Concrete wall Expansion anchor attachment as per the design of the seismic bracing system and Section 4.6 2. Warning: Locate steel reinforcement/ rebar before drilling. Follow bolt manufacturer s installation guidelines. 3. Break strength certifi ed, pre-stretched cable 4. 1. Standard Bracket End Fitting Double stacked (GS25 system) 2. Standard Bracket End Fitting (GS12 and GS19 systems) 3. Eyelet End Fitting (GS12 system) 4. Cable looped through a loose Standard Bracket, secured with a Fastener Either factory swaged end fi tting or loop through a Gripple Bracket with Fastener (30º - 60º) 22

4.1.2 Brace Anchor/Attachment Installation / Concrete Ceiling/Roof 1. Anchor design shall be in accordance with the applicable building code seismic provisions. Typically this will include compliance with ACI318, Appendix D. See Section 4.6 for Attachment Design Strengths. 2. Refer to applicable International Code Council evaluation service reports (ICC-ES) for each specifi c anchor. 3. All non-gripple parts, rod hangers, support products and connectors shall be approved for seismic applications where required, and shall be designed by a licensed professional engineer responsible for the design. 4. Use caution when drilling or anchoring into a concrete surface, that the anchor embedment does not exceed the minimum required depth as established by the anchor manufacturer. 5. When using GS25, two double standard brackets must be used (see Section 3.3.1). 6. Building structure at anchor locations must be point load capable. Verify loading with structural engineer for the site/project. Expansion anchor attachment as per design of the seismic bracing system and Section 4.6 Concrete slab or roof 1. 2. 3. 4. (30º- 60º) Break strength certifi ed, pre-stretched cable Either factory swaged end fi tting or loop through a Gripple Bracket with Fastener 1. Eyelet End Fitting (GS12 system) 2. Standard Bracket End Fitting (GS12 and GS19 systems) 3. Standard Bracket End Fitting Double stacked (GS25 system) 4. Cable looped through a loose Standard Bracket, secured with a Gripple Seismic Fastener Warning: Locate steel reinforcement/ rebar before drilling. Follow bolt manufacturers installation guidelines. 23

4.1.3 Brace Anchor / Attachment Installation / Concrete over Metal Decking 1. Anchor design shall be in accordance with the applicable building code seismic design provisions. Typically this will include compliance with ACI318, Appendix D. See Section 4.6 for Attachment Design Strengths. 2. Refer to applicable International Code Council evaluation service reports (ICC-ES) for each specifi c anchor. 3. All non-gripple parts, rod hangers, support products and connectors shall be approved for seismic applications where required, and shall be designed by a licensed professional engineer responsible for the design. 4. Use caution when drilling or anchoring into a concrete surface, that the anchor embedment does not exceed the minimum required depth as established by the anchor manufacturer. 5. When using GS25, two double standard brackets must be used (see Section 3.3.1). 6. Building structure at anchor locations must be point load capable. Verify loading with structural engineer for the site/project. Expansion anchor attachment as per design and orientation at metal decking per manufacturer s instructions. See Section 4.6 for attachment design strength. Concrete over metal deck 1. 1. Either Gripple Eyelet or Standard Bracket Either factory swaged end fi tting or loop through a Gripple Bracket with Fastener (30º - 60º) Break strength certifi ed, pre-stretched cable 1. Standard Bracket end fi tting (GS12 and GS19 systems) Warning: Locate steel reinforcement/ rebar before drilling. Follow bolt manufacturer s installation guidelines. 24

4.1.3 Brace Anchor / Attachment Installation / Concrete over Metal Decking (cont.) 1. Anchor design shall be in accordance with the applicable building code seismic design provisions. Typically this will include compliance with ACI318, Appendix D. See Section 4.6 for Attachment Design Strengths. 2. Refer to applicable International Code Council evaluation service reports (ICC-ES) for each specifi c anchor. 3. All non-gripple parts, rod hangers, support products and connectors shall be approved for seismic applications where required, and shall be designed by a licensed professional engineer responsible for the design. 4. Use caution when drilling or anchoring into a concrete surface, that the anchor embedment does not exceed the minimum required depth as established by the anchor manufacturer. 5. When using GS25, two double standard brackets must be used (see Section 3.3.1). 6. Building structure at anchor locations must be point load capable. Verify loading with registered professional engineer for the site/project. Strut, strut attachment anchors, and bracket anchor to strut per design and Section 4.6 Concrete slab on metal deck. 1. Either swaged end fi tting or loop through a Gripple Bracket with Fastener 1. Note: Position of strut in line with deck ribs. Either Gripple Eyelet, Standard or Double Bracket (30º - 60º) Angle may not vary from parallel to deck ribs any more than ±5 o. (This excludes 4-Way braces.) Break strength certifi ed, pre-stretched cable 1. Standard Bracket End Fitting (GS12 and GS19 systems) Warning: Locate steel reinforcement/ rebar before drilling. Follow bolt manufacturer s installation guidelines. 25

4.1.3 Brace Anchor / Attachment Installation / Concrete over Metal Decking (cont.) 1. Anchor design shall be in accordance with the applicable building code seismic design provisions. Typically this will include compliance with ACI318, Appendix D. See Section 4.6 for Attachment Design Strengths. 2. Refer to applicable International Code Council evaluation service reports (ICC-ES) for each specifi c anchor. 3. All non-gripple parts, rod hangers, support products and connectors shall be approved for seismic applications where required, and shall be designed by a licensed professional engineer responsible for the design. 4. Use caution when drilling or anchoring into a concrete surface, that the anchor embedment does not exceed the minimum required depth as established by the anchor manufacturer. 5. When using GS25, two double standard brackets must be used (see Section 3.3.1). 6. Building structure at anchor locations must be point load capable. Verify loading with structural engineer for the site/project. Strut, strut attachment anchors, and bracket anchor to strut per design and Section 4.6 Concrete slab over metal deck Either Gripple Eyelet, Standard or Double Bracket 1. Either a factory swaged end fi tting or loop through a Gripple Bracket withfastener Break strength certifi ed, pre-stretched cable 1. Note: position of strut perpendicular with deck ribs. Break strength certifi ed, pre-stretched Gripple Seismic cable (30º - 60º) Angle may not vary more than ±5 o from perpendicular to deck ribs. (This excludes 4-Way braces.) 1. Standard Bracket end fi tting (GS12 and GS19 systems) Warning: Locate steel reinforcement/ rebar before drilling. Follow bolt manufacturer s installation guidelines. 26

4.1.4 Brace Anchor / Attachment Installation / Concrete Block Wall 1. Anchor design shall be in accordance with the applicable building code seismic design provisions. Typically this will include compliance with ACI318, Appendix D. See Section 4.6 for Attachment Design Strengths. 2. Refer to applicable International Code Council evaluation service reports (ICC-ES) for each specifi c anchor. 3. All non-gripple parts, rod hangers, support products and connectors shall be approved for seismic applications where required, and shall be designed by a licensed professional engineer responsible for the design. 4. Use caution when drilling or anchoring into a wall, that the anchor embedment does not exceed the minimum required wall width as established by the anchor manufacturer. 5. When using GS25, two double standard brackets must be used (see Section 3.3.1). 6. Building structure at anchor locations must be point load capable. Verify loading with structural engineer for the site/project. Grouted concrete wall block Hollow concrete block wall Anchor attachments per design of the seismic bracing system and specifi c anchor manufacturer instructions and Section 4.6 Gripple Eyelet, Standard or Double Bracket end fi ttings Break strength certifi ed, pre-stretched Gripple Seismic cable Either factory swaged end fi tting or loop through a Gripple Bracket wtih Fastener (30º - 60º) 27

4.2 Brace Anchor / Attachment Installation / Steel Beam 1. Anchor design shall be in accordance with the applicable building code seismic design provisions and hardware manufacturer s approved design data. See Section 4.6 for Attachment Design Strengths. 2. Refer to applicable International Code Council evaluation service reports (ICC-ES) for each specifi c anchor and attaching hardware. 3. All non-gripple parts, rod hangers, support products and connectors shall be approved for seismic applications where required, and shall be designed by a licensed professional engineer responsible for the design. 4. When using GS25, two double standard brackets must be used (see Section 3.3.1). 5. Building structure at anchor locations must be point load capable. Verify loading with structural engineer for the site/project. Metal deck Steel beam Strut and beam clamps as required by design and Section 4.6 Either a factory swaged end fi tting or a loop through a Gripple Bracket with Fastener Either Gripple Eyelet or Standard Bracket (30º - 60º) Break strength certifi ed, pre-stretched cable Angle may not vary from parallel to the strut no more than ±5 o Beam End View Beam Side View 28

4.3.1 Brace Anchor / Attachment Installation / Bar Joist - Transverse or Longitudinal 1. Details below indicate how braces may be attached to a bar joist structure. 2. All non-gripple parts, rod hangers, support products and connectors shall be approved for seismic applications where required, and shall be designed by a licensed professional engineer responsible for the design. 3. Building structure at anchor locations must be point load capable. Verify loading with structural engineer for the site/project. 4. The Gripple seismic cable shall only be attached to the top chord of the bar joist member. Loop must be formed around top of bar joist in between web members as shown, then secured with Gripple Seismic Fastener Note: For the bracing arrangements detailed here, two seismic fasteners may be required (one at each end of the cable brace supplied without factory swaged on brackets). Joist web member 12 mininum Fastener (30º-60º) Leave a minimum 2 tail when installing Gripple Fastener Break strength certified, pre-stretched Gripple Seismic cable Looped around bar joist, secured with Fastener, as detailed above Hanger location Connection to equipment Looped around bar joist, secured with Fastener, as detailed above Hanger location Hanger location Connection to equipment Connection to equipment 29

4.3.2 Brace Anchor / Attachment Installation / Bar Joist - 4-Way Bracing 1. Details below indicate how braces may be attached to a bar joist structure for a 4-Way brace system. 2. All non-gripple parts, rod hangers, seismic support and connectors shall be approved for seismic applications where required, and shall be designed by a licensed professional engineer responsible for the design. 3. Building structure at anchor locations must be point load capable. Verify loading with structural for the site/project. 4. The Gripple seismic cable shall only be attached to the top chord of the bar joist member. Note: For the bracing arrangements detailed here, two seismic fasteners may be required (one at each end of the cable brace supplied without a factory swaged on bracket). Looped around bar joist, secured with Fastener, as detailed in Section 4.3.1 Hanger location Connection to equipment Break strength certified pre-stretched Gripple Seismic cable. Cable angles shall be per Section 1.4.3 Looped around bar joist, secured with Fastener, as detailed in Section 4.3.1 Hanger location Hanger location Connection to equipment Break strength certified pre-stretched Gripple Seismic cable. Cable angles shall be per Section 1.4.3 30

4.4 Brace Anchor / Attachment Installation / Steel Beams 1. Details below indicate how braces may be attached to steel beams in a building structure. See Section 4.6 for Attachment Design Strengths. 2. All non-gripple parts, rod hangers, support products and connectors shall be approved for seismic applications where required, and shall be designed by a licensed professional engineer responsible for the design. 3. Building structure at anchor locations must be point load capable. Verify loading with structural engineer for the site/project. Warning: Obtain approval from site structural engineer before attaching or drilling into beams. Added reinforcement may be required. Concrete Filled Metal Deck Seismic Clamp Attachment Steel Beam * Eyelet end fitting shown. Alternatively a Standard Bracket could be used. Strut Bolt & Channel Nut Transverse or Longitudinal Hanger location Hanger location Hanger location 4-Way bracing Hanger location Hanger location Hanger location Steel beam Either run direction s shall be per Section 1.4.3 31

4.5 Brace Anchor / Attachment Installation / Timber Members 1. Details below indicate how braces may be attached to timber structural members. Design shall be in accordance with National Design Specifi cation for Wood Construction ASO/LRFO, 2005 edition. 2. All non-gripple parts, rod hangers, support products and connectors shall be approved for seismic applications where required, and shall be designed by a licensed or registered professional engineer responsible for the site/project. 3. Building structure at anchor locations must be point load capable. Verify loading with structural engineer for the site/project. Warning: Obtain approval from site structural engineer before attaching or drilling into beams. * Eyelet end fitting shown. Alternatively a Standard Bracket could be used. * Break strength certifi ed, pre-stretched cable 9x bolt dia minimum Design of bolt must be in upper half of beam (30º-60º) 3 min * (30º-60º) 9x lag screw dia minimum Lag screw 3 min * Gripple Eyelet or Gripple Standard Bracket Lag Screw as required by design * (30º-60º) 32

4.6.1 Attachment Design / Selected Structural Attachment Design Strengths ANCHORAGE TO STRUCTURE (ATTACHMENT): Design strengths (LRFD capacity values) have been calculated using national / industry approved standards for various structural attachment methods for the Bracing System. Structural attachment methods considered herein include: Expansion anchors to normal weight concrete slab or normal weight concrete wall Expansion anchors to concrete-fi lled (lightweight or normal weight) metal deck Anchors to solid-grouted concrete masonry block wall Lag Screws to wood beams Clamps to structural steel beams Gravity and seismic demands shall be combined using the load combinations specifi ed in Section 2.3 of ASCE/SEI 7-05. Assumptions used in calculating the anchor capacities are specifi ed in each of the anchorage sections. Assumptions are typically conservative, but are representative of the most common conditions that are expected to be encountered. If the actual in-situ conditions are not bounded by the assumptions used in the capacity calculations, a seismic engineer may determine anchorage values for these alternate attachment conditions based on a code rationale approach. Expansion Anchors to Normal Weight Concrete Slab or Wall Refer to tables on the following page for anchorage to normal weight concrete slabs or normal weight concrete walls using mechanical expansion anchors. Anchor capacities for tension and shear forces are provided for the Hilti Kwik Bolt TZ and the Powers Power-Stud+ SD2 expansion anchors. The capacities have been calculated in compliance with ACI 318-08 and include a reduction factor of 0.4 for non-ductile failure modes (per Section D.3.3.6) as appropriate. The adequacy of the anchor shall be determined by considering the interaction of tension and shear forces using the following relationship: Tensile Demand Tensile Strength Shear Demand Shear Strength 1.2 33

4.6.2 Attachment Design / Normal Weight Concrete Anchor Diameter (in.) 3/8 1/2 1/2 5/8 5/8 3/4 3/4 Design Strengths for Anchorage to Normal Weight Concrete Slab Hilti Kwik Bolt TZ Expansion Anchors 1, 2 Nominal Embed. (in.) 2.625 2.625 4.0 3.875 4.75 4.625 Effective Embed. (in.) 2.0 2.0 3.25 3.125 4.0 3.75 4.75 Minimum Member Thickness (in.) 4.0 4.0 6.0 5.0 6.0 6.0 8.0 Tension (lbs.) 485 510 1,050 1,000 1,450 1,320 1,880 3, 4, 5 Shear (lbs.) 550 550 2,290 2,160 3,130 2,840 4,050 3, 4, 5 Install. Torque (ft-lbs.) 25 40 40 60 60 110 110 1. Design strength of anchors determined in accordance with ACI 318-08 Appendix D Provisions (cracked concrete conditions) using the anchor capacities listed in ESR-1917, Hilti Kwik Bolt TZ Carbon and Stainless Steel Anchors in Concrete (September 1, 2007) 2. Minimum concrete compressive strength = 3,000 psi 3. Expansion anchors are carbon steel 4. Anchor capacity reduced for non-ductile failure by a factor of 0.4 per Section D.3.3.6 of ACI 318-08 5. Values assume that critical edge distance and spacing requirements have been satisfied (no reductions applied to capacities) Anchor Diameter (in.) 3/8 1/2 1/2 5/8 5/8 3/4 3/4 Design Strengths for Anchorage to Normal Weight Concrete Slab Powers Power-Stud+ SD2 Expansion Anchors 1, 2 Nominal Embed. (in.) 2.375 2.5 3.75 3.875 4.875 4.5 5.75 Effective Embed. (in.) 2.0 2.0 3.25 3.25 4.25 3.75 5.0 Minimum Member Thickness (in.) 4.0 4.5 5.75 5.75 6.5 7.0 10.0 Tension (lbs.) 450 510 935 1,065 1,065 1,320 1,665 3, 4, 5 Shear (lbs.) 470 550 1,555 1,660 1,980 2,220 3,325 3, 4, 5 Install. Torque (ft-lbs.) 20 40 40 60 60 110 110 1. Design strength of anchors determined in accordance with ACI 318-08 Appendix D Provisions (cracked concrete conditions) using the anchor capacities listed in ESR-2502, Powers Power-Stud+ SD2 Anchors in Cracked and Uncracked Concrete (May 1, 2010) 2. Minimum concrete compressive strength = 3,000 psi 3. Expansion anchors are carbon steel 4. Anchor capacity reduced for non-ductile failure by a factor of 0.4 per Section D.3.3.6 of ACI 318-08 5. Values assume that critical edge distance and spacing requirements have been satisfied (no reductions applied to capacities) 34

4.6.3 Attachment Design / Concrete-Filled Metal Deck Refer to tables below for anchorage to concrete-fi lled metal deck using mechanical expansion anchors. The concrete fi ll can be lightweight or normal weight concrete, but must have a minimum compressive strength of 3,000 psi as identifi ed in Note 2 for the tables below. Anchor capacities for tension and shear forces are provided for the Hilti Kwik Bolt TZ and the Powers Power-Stud+ SD2 expansion anchors. The capacities have been calculated in compliance with ACI 318-08 and include a reduction factor of 0.4 for non-ductile failure (pullout in tension per Section D.3.3.6). The other applicable failure modes (steel in tension and steel in shear) are considered ductile failures. The adequacy of the anchor shall be determined by considering the interaction of tension and shear forces using the following relationship: Tensile Demand Tensile Strength Shear Demand Shear Strength 1.2 Design Strengths for Anchorage to Lightweight Concrete Filled Metal Deck 1, 2, 3 Hilti Kwik Bolt TZ Expansion Anchors Anchor Diameter (in.) 3/8 1/2 1/2 5/8 Nominal Embed. (in.) 2.625 2.625 4.0 3.875 Effective Embed. (in.) 2.0 2.0 3.25 3.125 Tension (lbs.) 285 285 510 390 4, 5, 6 Shear 4, 6 (lbs.) 1,385 1,950 3,215 2,990 Install. Torque (ft-lbs.) 25 40 40 60 1. Design strength of anchors determined in accordance with ACI 318-08 Appendix D Provisions (cracked concrete conditions) using the anchor capacities listed in ESR-1917, Hilti Kwik Bolt TZ Carbon and Stainless Steel Anchors in Concrete (September 1, 2007) 2. Concrete-filled metal deck with 3 deck and minimum 3.25 sand lightweight (or normal weight) concrete topping, minimum concrete compressive strength = 3,000 psi 3. Anchors can be installed into the upper or lower flute of the metal deck provided that adequate concrete cover (5/8 clear distance, ref Fig. 5 ESR-1917) is provided. 4. Expansion anchors are carbon steel 5. Anchor capacity reduced for non-ductile failure by a factor of 0.4 per Section D.3.3.6 of ACI 318-08 6. Values assume that critical edge distance and spacing requirements have been satisfied (no reductions applied to capacities) Design Strengths for Anchorage to Lightweight Concrete Filled Metal Deck 1, 2, 3 Powers Power-Stud+ SD2 Expansion Anchors Anchor Diameter (in.) 3/8 1/2 1/2 5/8 Nominal Embed. (in.) 2.375 2.5 3.75 3.875 Effective Embed. (in.) 2.0 2.0 3.25 3.25 Tension (lbs.) 280 285 505 645 4, 5, 6 Shear 4, 5 (lbs.) 520 (5) Install. Torque (ft-lbs.) 20 40 40 2,480 3,275 2,610 60 1. Design strength of anchors determined in accordance with ACI 318-08 Appendix D Provisions (cracked concrete conditions) using the anchor capacities listed in ESR-2502, Powers Power-Stud+ SD2 Anchors in Cracked and Uncracked Concrete (May 1, 2010) 2. Concrete-filled metal deck with 3 deck and minimum 3.25 sand lightweight (or normal weight) concrete topping, minimum concrete compressive strength = 3,000 psi 3. Anchors can be installed into the upper or lower flute of the metal deck provided that adequate concrete cover (3/4 clear distance, ref Fig. 4A ESR-2502) is provided. 4. Expansion anchors are carbon steel 5. Anchor capacity reduced for non-ductile failure by a factor of 0.4 per Section D.3.3.6 of ACI 318-08 6. Values assume that critical edge distance and spacing requirements have been satisfied (no reductions applied to capacities) 35

4.6.4 Attachment Design / Concrete Block Refer to table below for anchorage to solid-grouted concrete masonry walls using the Hilti Kwik Bolt 3 Masonry Anchor. The adequacy of the anchor shall be determined by considering the interaction of tension and shear forces using the following relationship: 5/3 5/3 Tensile Demand Shear Demand ( 1.0 Tensile Strength ( Shear Strength ( ( Design Strengths for Anchorage to Solid-Grouted CMU Wall Hilti Kwik Bolt 3 Masonry Anchors 1, 2 Anchor Diameter (in.) 3/8 3/8 1/2 1/2 5/8 5/8 3/4 3/4 Embed. Depth 3 (in.) 1.625 2.5 2.25 3.5 2.75 4 3.25 4.375 Tension (lbs.) 360 885 705 1,020 920 1,405 1,170 1,855 4, 5, 6 Shear (lbs.) 830 1,080 935 1,185 1,000 1,050 885 925 4, 5, 6 Install. Torque (ft-lbs.) 15 15 25 25 65 65 120 120 1. Design strength of anchors determined using the capacities listed in ESR-1385, Kwik Bolt 3 Masonry Anchors (February 1, 2010) 2. Anchors must be installed in the face shell of the masonry wall (constructed as follows: minimum Type I, Grade N, lightweight, mediumweight, or normal weight concrete units conforming to ASTM C90, fully-grouted with coarse grout) 3. Embedment depth shall be measured from the outside face of the concrete masonry unit 4. Expansion anchors are carbon steel 5. Allowable loads converted to design strengths using a factor of 1.414 6. Anchors must be located a minimum of 1.375 in away from any vertical mortar joint; anchor locations are limited to one per masonry cell with a minimum spacing of 8 on center; minimum distance from end of wall is 4 in 36

4.6.5 Attachment Design / Unistrut Beam Clamp Attachment Refer to table below for anchorage to a steel beam using strut and unistrut beam clamps. The beam clamps must be used in pairs, as shown in the fi gure below. Load orientations for Unistrut P2785 beam clamp Design Strength for Unistrut P2785 Beam Clamp 1, 2, 3 Pullout Slip Along Slip Thru (lbs.) (lbs.) (lbs.) 2,825 705 1,695 1. Design strengths for the Unistrut P2785 beam clamp reproduced from Tyco / Unistrut Design Load Report dated May 2008 2. Allowable loads converted to design strengths using a factor of 1.414 3. Design strength of channel nut and hex head bolt to the attached channel is limited as follows: 3/8-16 HHCS Resistance to Slip = 1,130 lbs Pull-out Strength = 1,410 lbs ½ 13 HHCS Resistance to Slip = 2,120 lbs Pull-out Strength = 2,830 lbs 37

4.6.6 Attachment Design / Anchor Prying Effects Calculations were performed to determine prying factors for anchorage design of the System. Prying forces were calculated for the eyelet and standard brackets only. Prying at the retrofi t bracket was not considered, as the retrofi t bracket is not utilized for anchorage to the structure. Prying factors were calculated using the evaluation procedure detailed in Section A.9.3.5.9.1 of the 2010 edition of NFPA 13, Standard for the Installation of Sprinkler Systems. Prying factors were calculated for the two installation confi gurations (Orientation 1 & 2), as illustrated below in the fi gure below. Installation configurations for prying factor calculations The results for the prying factor calculations are summarized in the table below. A single prying factor is provided that envelopes all of the GSS standard bracket sizes for braces oriented at 30 degrees, 45 degrees, and 60 degrees from horizontal. Prying Factors for Anchorage to Concrete Brace Angle 30 o Orientation 1 45 o 60 o 30 o Orientation 1 45 o 60 o GSS Bracket 1.35 1.85 2.20 2.20 1.85 1.35 GSE Eyelet 1.00 1.90 3.00 3.00 1.90 1.00 38

5.1.1 Round Ductwork / Transverse 1. Install cable assemblies with a 60º maximum angle from the horizontal plane. 2. Anchor cable assemblies to structure per Section 4, and as required by design. 3. Tighten cables to remove slack (see Section 3.2). 4. Hanger rod and rod stiffeners shall be by design and Section 3.4. 5. Building structure at anchor locations must be point load capable. Verify loading with structural engineer for the site/project. 6. For GS25 two brackets must be used at end fi ttings to cable (see Section 3.3.1). 7. Leave a 2 tail extending out of the Fastener for future adjustments. 8. Ensure locking screws are fully installed (hand-tight) into the Fastener on completion of installation. Anchorage to structure Hanger rod with stiffener as required Break strength certified, pre-stretched cable (30º- 60º) Fastener See detail Detail Round ductwork Section View Duct clamp hanger either/or Round ductwork Duct clamp hanger Max deviation ±5 o Looped through a Gripple Seismic Standard or Retrofit Bracket Standard or Retrofit Bracket (with bolt hole as per threaded rod dia) Top View 39