ADDENDUM NO YORK ROAD 1 ST AND 2 ND FLOOR RENOVATION TU-1949-SBR

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1 ADDENDUM NO YORK ROAD 1 ST AND 2 ND FLOOR RENOVATION TU-1949-SBR March 5, 2019 Ladies and Gentlemen: The purpose of this addendum is to clarify certain portions of the above-referenced project with all prospective vendors. Procurement Towson University 8000 York Road Towson, MD t f QUESTIONS: Q8. The scope of work included in the bid documents indicates that the GC is carrying the telecom work, but the drawings indicate that the telecom work is to be by owner. Please clarify. A8. Part 4. Scope of Services Overview h. i. indicates Data cabling shall be furnished and installed by the Contractor in accordance with TU Cabling Standards. One green cable for each security camera location as indicated on drawings SEC1 and SEC2. Q9. The scope of work included in the bid documents indicates that there is Wireless Access Point and Camera cabling for this project, but the drawings do not show any locations for such cabling. Please clarify. A9. Wireless Access Point (WAP) and Camera cabling shall be pulled to data room 113 on the first floor and data room 238 on the second floor. WAP are indicated on the T series drawings and security camera locations are shown on the SEC drawings. TU will furnish and install the mounting box and cameras as indicated on the drawings. Q10. The scope of work included in the bid documents indicates that for standard data locations only (1) Orange Cat6 is required, but on the drawings there are standard data locations shown that would logically need more than (1) Orange Cat6 cable, such a furniture/desks that have more than one seat. Please clarify. A10. All data drop symbols in the T series drawings have a number next to them indicating the number of cables to install. For example, the following icon shows 2 orange cat6 cables for 2 seats: Q11. There is no mention in the specs of liner in the U Shaped transfer ducts, nor is there liner shown on the drawings. Usually these transfers are lined. How should we proceed? Please clarify.

2 TU-1949-SBR Addendum #3 Page 2 of 3 A11. An updated specification Section with the full requirements for air transfer silencers has been attached to this addendum. Please replace Section Air Duct Accessories in its entirety however, please note that changes have been made only to article 2.5 Air Transfer Silencers. Q12. Confirming that Ref includes sound-lining (elastomeric as specified) in duct fifteen feet from the VAV system AHUs. The specs then state Supply ducts from VAV boxes units to air devices shall be acoustically lined as noted on drawings. Since there is nothing noted about liner in the low pressure ducts on the drawings we will be excluding this. Please Confirm. A12. This assumption is incorrect. Please note duct lining IS shown downstream of VAV boxes in the details on drawing M6.02. Please refer to details Fan-Powered VAV Box w/ Hot Water Reheat and VAV Box w/ Hot Water Reheat on M6.02. Q13. There are glass marker boards noted on the drawings but not in the specifications. Is there a specific brand you are using for this project and how many glass board writing surfaces are you in need of? A13. The Contractor is not required to furnish and install glass marker boards. This will be handled by TU as a fixtures, furniture and equipment (FFE) item outside of the GC contract. Q14. Can you please confirm what, if any, of the Technology information provided in the original ITB is part of our scope? A14. If the Technology question is referring to the A/V portion of the project, please refer to Part 4. Scope of Services A/V cabling must be done by the A/V installer not through the GC. The Contractor must provide the following conduit per our standards: "in addition to the conduit for a quad electric outlet and 4 network drops, each floor box must have separate conduit for A/V signal and speaker, mic, camera cabling. Three 1 conduits or a 2 and a 1 conduit." The three 1" conduits or the 1" and 2" conduits must be dedicated to A/V only. The Contractor can just leave a pull string in this conduit for the A/V installer. Q15. On the finish schedule under the Frames C.R. section. Are we to price all Hollow metal frames or does C.R. stand for something else? A15. C.R. stands for Chair Rail. This is a general heading and there is no chair rail on this project. As a general note, the Finish Schedule is calling out finishes only, and not specifying the type of door or frame construction. Q16. On the finish schedule under the doors section. All of the openings saying WD it says to price as Maple. There is also a note on this page saying Metal doors only to be painted P8 but there are numerous openings saying WD,P8- Are these supposed to be painted wood doors? Metal Doors? A16. Again, the Finish Schedule is calling out finishes only, and not specifying the type of door or frame construction. The door schedule would call out any new doors and the type of material and frames they should have. There are many existing doors in this project. Some are wood (WD), in a natural finish, and some are metal, in a painted finish. Both of these occur in different places along the hallway and this is why you see WD, P8 called out with the note to only paint the metal doors, P8. Q17. After reviewing the finish schedule openings and the floor plans all doors are accounted for on the floor plans except (1) type 4 pair of doors and (1) type 1 door

3 TU-1949-SBR Addendum #3 Page 3 of 3 on the first floor and (1) type 6 door on the second floor. I m not sure where these are on the finish schedule. A17. Type 4 door is near room 127 in corridor. There are (7) type 1 doors on the first floor; (1) type 1 in room 128, 129, 130, 132, 133 and (2) type 1 doors in room 131. The type 6 door is near room 206K on the second floor. Q18. I was unable to find room # 1-1, 1-2, 1-3, 1-4, 2-1, 2-2, 2-3, 2-5, 2-6, and 200 on the floor plans. Are we pricing these? And if so we need to know what door types go with which. A18. Please refer to finish drawings A5 and A6. These designations are for corridors noted on the plans. Q19. Can you confirm the scheduled drop ceiling height? A19. Ceiling elevations will be generally be the same as existing. The ceiling heights will be primarily dictated by above ceiling ductwork, plumbing, electrical and cabling. Q20. Going through the IFB and Specifications there isn t anything listed regarding the attic stock requirement for things such as ceiling tile, flooring or other 9000 finishes. Is there a requirement that I need to make sure we include. I assume this may be a Towson standard but I would like confirmation for this project. A20. Attic Stock as left by the contractor shall be undamaged and in original packaging. No construction surplus or partially used or open packages allowed. (2) cartons of ceiling tile, (2) cartons of each type of carpet tile, (2) cartons of vinyl cove base, (2) rolls of VT1 and (1) gallon of each type of paint used on the project are required. Q21. Please advise what signage is needed for this project. Referencing dwg A7, it talks about room number signage per Towson University standards. Would you like us to provide our own count for the rooms under construction? And what additional signage is needed for the project? (if any at this time) A21. No additional signage is needed beyond room number signs and life safety signs. Price review the STANDARDS INTERIOR SIGNAGE which is included in the solicitation. All addenda will be incorporated into the final contract documents and will be binding on all vendors responding to this solicitation. Each vendor submitting a bid/proposal must acknowledge receipt of all addenda by completing and forwarding Exhibit K (included in the bid package) with the bid response; failure to acknowledge addenda may result in bid/proposal rejection. If you have any questions regarding this addendum, please contact me at (410) or me at MLCompton@towson.edu. Sincerely, Michelle Compton Procurement Officer Representative Attachments: Specification Section SF Air Duct Accessories

4 SECTION AIR DUCT ACCESSORIES PART 1 - GENERAL 1.1 SUMMARY A. Section Includes: 1. Backdraft and pressure relief dampers. 2. Manual volume dampers. 3. Air transfer silencers 4. Flange connectors. 5. Turning vanes. 6. Duct-mounted access doors. 7. Flexible connectors. 8. Duct accessory hardware. B. Related Requirements: 1. Section "Flexible Ducts" for insulated and non-insulated flexible ducts. 2. Section "Addressable Fire-Alarm Systems" for duct-mounted fire and smoke detectors. 3. Section "Conventional Fire-Alarm Systems" for duct-mounted fire and smoke detectors. 1.2 ACTION SUBMITTALS A. Product Data: For each type of product. B. Shop Drawings: For duct accessories. Include plans, elevations, sections, details and attachments to other work. 1. Detail duct accessories fabrication and installation in ducts and other construction. Include dimensions, weights, loads, and required clearances; and method of field assembly into duct systems and other construction. Include the following: a. Special fittings. b. Manual volume damper installations. c. Fire-damper and smoke-damper installations, including sleeves; and duct-mounted access doors. d. Wiring Diagrams: For power, signal, and control wiring. 1.3 CLOSEOUT SUBMITTALS A. Operation and maintenance data. TOWSON UNIVERSITY

5 PART 2 - PRODUCTS 2.1 ASSEMBLY DESCRIPTION A. Comply with NFPA 90A, "Installation of Air Conditioning and Ventilating Systems," and with NFPA 90B, "Installation of Warm Air Heating and Air Conditioning Systems." B. Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible" for acceptable materials, material thicknesses, and duct construction methods unless otherwise indicated. Sheet metal materials shall be free of pitting, seam marks, roller marks, stains, discolorations, and other imperfections. 2.2 MATERIALS A. Galvanized Sheet Steel: Comply with ASTM A653/A653M. 1. Galvanized Coating Designation: G Exposed-Surface Finish: Mill phosphatized. B. Reinforcement Shapes and Plates: Galvanized-steel reinforcement where installed on galvanized sheet metal ducts; compatible materials for aluminum and stainless-steel ducts. 2.3 BACKDRAFT AND PRESSURE RELIEF DAMPERS A. Description: Gravity balanced. B. Maximum Air Velocity: 1250 fpm. C. Maximum System Pressure: 2-inch wg. D. Frame: Hat-shaped, inch-thick, galvanized sheet steel, with welded corners or mechanically attached. E. Blades: Multiple single-piece blades, center pivoted, maximum 6-inch width, inch-thick aluminum sheet with sealed edges. F. Blade Action: Parallel. G. Blade Seals: Neoprene, mechanically locked. H. Blade Axles: 1. Material: Galvanized steel. 2. Diameter: 0.20 inch. I. Tie Bars and Brackets: Galvanized steel. J. Return Spring: Adjustable tension. TOWSON UNIVERSITY

6 K. Bearings: Steel ball or synthetic pivot bushings. L. Accessories: 1. Adjustment device to permit setting for varying differential static pressure. 2. Counterweights and spring-assist kits for vertical airflow installations. 3. Electric actuators. 4. Chain pulls. 5. Screen Mounting: Front mounted in sleeve. a. Sleeve Thickness: 20 gauge minimum. b. Sleeve Length: 6 inches minimum. 6. Screen Mounting: Rear mounted. 7. Screen Material: Aluminum. 8. Screen Type: Bird degree stops. 2.4 MANUAL VOLUME DAMPERS A. Standard, Steel, Manual Volume Dampers: 1. Standard leakage rating, with linkage outside airstream. 2. Suitable for horizontal or vertical applications. 3. Frames: a. Frame: Hat-shaped, inch-thick, galvanized sheet steel. b. Mitered and welded corners. c. Flanges for attaching to walls and flangeless frames for installing in ducts. 4. Blades: a. Multiple or single blade. b. Parallel- or opposed-blade design. c. Stiffen damper blades for stability. d. Galvanized-steel, inch thick. 5. Blade Axles: Galvanized steel. 6. Bearings: a. Molded synthetic. b. Dampers in ducts with pressure classes of 3-inch wg or less shall have axles full length of damper blades and bearings at both ends of operating shaft. 7. Tie Bars and Brackets: Galvanized steel. TOWSON UNIVERSITY

7 2.5 AIR TRANSFER SILENCERS A. Quality Assurance 1. Air transfer silencers shall be installed in accordance with NFPA 90A and with NFPA 90B. 2. Air transfer silencer performance must have been substantiated in a NVLAP test facility in accordance with ASTM E Test facilities and reports shall be open to inspection from project engineer. B. Warranty 1. Provide 12 month manufacturer warranty from date of shipment for duct air transfer silencers. C. Basis of Design: Price Industries D. Return Air Silencer (RAS-LP): 1. Performance: a. Silencer performance characteristics, including insertion loss and pressure drop, shall be attained through testing in accordance with ASTM Standard E477. b. Laboratory performance verification in the manufacturer s test facility may be requested, in which case a comparative test report shall be made available to the engineer. 2. Construction: a. Air transfer silencers shall be constructed in accordance with ASHRAE and SMACNA Standards for the pressure and velocity classification specified for the air distribution system in which it is installed. b. Air transfer silencers shall be constructed of: 1) 24 gauge solid galvanized steel casing 2) 24 gauge perforated galvanized steel liner 3) Absorptive acoustic fiberglass. c. Acoustic media: 1) Acoustic media shall be shot-free inorganic glass fiber with long, resilient fibers, bonded with thermosetting resin. 2) Glass fiber shall be packed with a minimum of 10% compression to eliminate voids and settling. 3) Acoustic media shall be lined with a layer of fiberglass cloth securely wrapped around the internal acoustic media to prevent contamination from moisture and airborne particulate that may be present in the airstream. d. Fire-Performance Characteristics: TOWSON UNIVERSITY

8 E. Cross Talk Silencer (XTU): 1. Performance: 1) Air transfer silencer assemblies, including acoustic media fill, sealants, and acoustical spacers shall have combustion rating equal to or less than shown below when tested according to ASTM E84, NFPA 255 or UL 723: a) Flame-spread index not exceeding 25 b) Smoke-developed index not exceeding 50 a. Cross Talk Silencer performance characteristics, including insertion loss and pressure drop, shall be attained through testing in accordance with ASTM Standard E477. b. Laboratory performance verification in the manufacturer s test facility may be requested, in which case a comparative test report shall be made available to the engineer. 2. Construction: a. Cross Talk silencers shall be constructed in accordance with ASHRAE and SMACNA Standards for the pressure and velocity classification specified for the air distribution system in which it is installed. b. Cross Talk silencers shall be constructed of: 1) 22 gauge solid steel casing 2) 26 gauge solid steel internal noses at inlet and outlet 3) 3/4 inch dual density absorptive fiberglass media. c. Cross Talk silencers shall be fastened with the use of button lock, Pittsburgh lock, and welds. Screws and other types of mechanical fasteners shall not be acceptable. d. Acoustic media: 1) Acoustic media shall be shot-free inorganic glass fiber with long, resilient fibers, bonded with thermosetting resin. 2) Glass fiber shall be in accordance with erosion requirements of UL 181, and shall conform to the physical properties and requirements of ASTM C1071. e. Fire-Performance Characteristics: 1) Cross Talk silencer assemblies, including acoustic media fill, sealants, and acoustical spacers shall have combustion rating equal to or less than shown below when tested according to ASTM E84, NFPA 255 or UL 723: a) Flame-spread index not exceeding 25 b) Smoke-developed index not exceeding 50 TOWSON UNIVERSITY

9 2.6 FLANGE CONNECTORS A. Description: Add-on or roll-formed, factory-fabricated, slide-on transverse flange connectors, gaskets, and components. B. Material: Galvanized steel. C. Gauge and Shape: Match connecting ductwork. 2.7 TURNING VANES A. Manufactured Turning Vanes for Metal Ducts: Curved blades of galvanized sheet steel; support with bars perpendicular to blades set; set into vane runners suitable for duct mounting. 1. Acoustic Turning Vanes: Fabricate airfoil-shaped aluminum extrusions with perforated faces and fibrous-glass fill. B. Manufactured Turning Vanes for Nonmetal Ducts: Fabricate curved blades of resin-bonded fiberglass with acrylic polymer coating; support with bars perpendicular to blades set; set into vane runners suitable for duct mounting. C. General Requirements: Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible"; Figures 4-3, "Vanes and Vane Runners," and 4-4, "Vane Support in Elbows." D. Vane Construction: Single wall. 2.8 DUCT-MOUNTED ACCESS DOORS A. Duct-Mounted Access Doors: Fabricate access panels according to SMACNA's "HVAC Duct Construction Standards - Metal and Flexible"; Figures 7-2, "Duct Access Doors and Panels," and 7-3, "Access Doors - Round Duct." 1. Door: a. Double wall, rectangular. b. Galvanized sheet metal with insulation fill and thickness as indicated for duct pressure class. c. Vision panel. d. Hinges and Latches: 1-by-1-inch butt or piano hinge and cam latches. e. Fabricate doors airtight and suitable for duct pressure class. 2. Frame: Galvanized sheet steel, with bend-over tabs and foam gaskets. 3. Number of Hinges and Locks: a. Access Doors Less Than 12 Inches Square: No hinges and two sash locks. b. Access Doors up to 18 Inches Square: Two hinges and two sash locks. c. Access Doors up to 24 by 48 Inches: Three hinges and two compression latches with outside and inside handles. TOWSON UNIVERSITY

10 d. Access Doors Larger Than 24 by 48 Inches: Four hinges and two compression latches with outside and inside handles. 2.9 FLEXIBLE CONNECTORS A. Materials: Flame-retardant or noncombustible fabrics. B. Coatings and Adhesives: Comply with UL 181, Class 1. C. Metal-Edged Connectors: Factory fabricated with a fabric strip 3-1/2 inches wide attached to two strips of 2-3/4-inch-wide, inch-thick, galvanized sheet steel or inch-thick aluminum sheets. Provide metal compatible with connected ducts. D. Indoor System, Flexible Connector Fabric: Glass fabric double coated with neoprene. 1. Minimum Weight: 26 oz./sq. yd.. 2. Tensile Strength: 480 lbf/inch in the warp and 360 lbf/inch in the filling. 3. Service Temperature: Minus 40 to plus 200 deg F DUCT ACCESSORY HARDWARE A. Instrument Test Holes: Cast iron or cast aluminum to suit duct material, including screw cap and gasket. Size to allow insertion of pitot tube and other testing instruments and of length to suit duct-insulation thickness. B. Adhesives: High strength, quick setting, neoprene based, waterproof, and resistant to gasoline and grease. PART 3 - EXECUTION 3.1 INSTALLATION A. Install duct accessories according to applicable details in SMACNA's "HVAC Duct Construction Standards - Metal and Flexible" for metal ducts. B. Install duct accessories of materials suited to duct materials; use galvanized-steel accessories in galvanized-steel. C. Install backdraft dampers at inlet of exhaust fans or exhaust ducts as close as possible to exhaust fan unless otherwise indicated. D. Install volume dampers at points on supply, return, and exhaust systems where branches extend from larger ducts. E. Set dampers to fully open position before testing, adjusting, and balancing. F. Install test holes at fan inlets and outlets and elsewhere as indicated. TOWSON UNIVERSITY

11 G. Install air transfer silencers according to manufacturer s written installation instructions. H. Support duct air transfer silencers independently from ductwork. I. Ensure duct air transfer silencers are installed with airflow arrows in direction of airflow. J. Install duct access doors on sides of ducts to allow for inspecting, adjusting, and maintaining accessories and equipment at the following locations: 1. On both sides of duct coils. 2. Upstream and downstream from duct filters. 3. At outdoor-air intakes and mixed-air plenums. 4. At drain pans and seals. 5. Downstream from manual volume dampers, control dampers, backdraft dampers, and equipment. 6. Adjacent to and close enough to fire or smoke dampers, to reset or reinstall fusible links. Access doors for access to fire or smoke dampers having fusible links shall be pressure relief access doors and shall be outward operation for access doors installed upstream from dampers and inward operation for access doors installed downstream from dampers. 7. At each change in direction and at maximum 50-foot spacing. 8. Upstream and downstream from turning vanes. 9. Upstream or downstream from duct silencers. 10. Control devices requiring inspection. 11. Elsewhere as indicated. K. Install access doors with swing against duct static pressure. L. Access Door Sizes: 1. One-Hand or Inspection Access: 8 by 5 inches. 2. Two-Hand Access: 12 by 6 inches. 3. Head and Hand Access: 18 by 10 inches. 4. Head and Shoulders Access: 21 by 14 inches. 5. Body Access: 25 by 14 inches. 6. Body plus Ladder Access: 25 by 17 inches. M. Label access doors according to Section "Identification for HVAC Piping and Equipment" to indicate the purpose of access door. N. Install flexible connectors to connect ducts to equipment. O. Install duct test holes where required for testing and balancing purposes. 3.2 FIELD QUALITY CONTROL A. Tests and Inspections: 1. Operate dampers to verify full range of movement. 2. Inspect locations of access doors and verify that purpose of access door can be performed. TOWSON UNIVERSITY

12 3. Operate fire and smoke dampers to verify full range of movement and verify that proper heat-response device is installed. 4. Inspect turning vanes for proper and secure installation. END OF SECTION TOWSON UNIVERSITY