A. This Section includes acoustical panel ceilings installed with exposed suspension systems.

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1 SECTION ACOUSTICAL PANEL CEILINGS PART 1 - GENERAL 1.01 RELATED DOCUMENTS A. Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section SUMMARY A. This Section includes acoustical panel ceilings installed with exposed suspension systems. B. Related Sections: The following sections contain requirements that relate to this section: 1.03 SUBMITTALS 1. Division 15 Section "Fire Protection" for sprinkler heads in acoustical ceilings. 2. Division 15 Section "Air Outlets and Inlets" for grilles, registers, and diffusers in acoustical ceilings. 3. Division 16 Section "Lighting Fixtures" for lighting fixtures in acoustical ceilings. A. Product data for each type of product specified. B. Research reports or evaluation reports of the model code organization, acceptable to authorities having jurisdiction, that show compliance of acoustical ceiling system and components with building code in effect for Project. C. Product test reports from qualified independent testing laboratory that are based on its testing of current products for compliance of acoustical ceiling systems and components with requirements.

2 1.04 QUALITY ASSURANCE A. Installer Qualifications: Engage an experienced Installer who has successfully completed acoustical ceilings similar in material, design, and extent to those indicated for Project. B. Fire-Performance Characteristics: Provide acoustical ceilings that are identical to those tested for the following fire-performance characteristics, per ASTM test method indicated below, by UL or other testing and inspecting organizations acceptable to authorities having jurisdiction. Identify acoustical ceiling components with appropriate markings of applicable testing and inspecting organization. 1. Surface Burning Characteristics: As follows, tested per ASTM E 84, and complying with ASTM E 1264 for Class A products. a. Flame Spread: 25 or less. b. Smoke Developed: 50 or less. C. Single-Source Responsibility for Ceiling Units: Obtain each type of acoustical ceiling unit from a single source, with resources to provide products of consistent quality in appearance and physical properties, without delaying progress of the Work. D. Single-Source Responsibility for Suspension System: Obtain each type of suspension system from a single source, with resources to provide products of consistent quality in appearance and physical properties, without delaying progress of the Work. E. Coordination of Work: Coordinate layout and installation of acoustical ceiling units and suspension system components with other construction that penetrates ceilings, or is supported by them, including light fixtures, HVAC equipment, fire-suppression system components (if any), and partition system (if any). F. Preinstallation Conference: Conduct conference at Project site to comply with requirements of Division 1 Section "Project Meetings." 1.05 DELIVERY, STORAGE, AND HANDLING A. Before installing acoustical ceiling units, permit them to reach room temperature and a stabilized moisture content.

3 B. Handle acoustical ceiling units carefully to avoid chipping edges or damaging units in any way PROJECT CONDITIONS A. Space Enclosure: Do not install interior acoustical ceilings until space is enclosed and weatherproof, wet-work in space is completed and nominally dry, work above ceilings is complete, and ambient conditions of temperature and humidity will be continuously maintained at values near those indicated for final occupancy EXTRA MATERIALS A. Deliver extra materials to Owner. Furnish extra materials described below that match products installed, are packaged with protective covering for storage, and are identified with appropriate labels. 1. Acoustical Ceiling Units: Furnish quantity of full-size units equal to 2.0 percent of amount installed. 2. Exposed Suspension System Components: Furnish quantity of each exposed component equal to 2.0 percent of amount installed. PART 2 - PRODUCTS 2.01 MANUFACTURERS A. Acoustical Panels: Subject to compliance with requirements, provide one of the following: 1. Armstrong World Industries, Inc. 2. USG Interiors, Inc. 3. Celotex Corp. B. Suspension Systems: Subject to compliance with requirements, provide products by one of the following: 1. Armstrong World Industries, Inc. 2. Chicago Metallic Corporation. 3. USG Interiors, Inc.

4 C. Products: Specific products of Armstrong World Industries, Inc. are indicated in Product Data Sheets at end of this Section to establish a standard of quality, appearance, and performance ACOUSTICAL CEILING UNITS, GENERAL A. Standard for Acoustical Ceiling Units: Provide manufacturers' standard units of configuration indicated that comply with ASTM E 1264 classifications as designated by reference to types, patterns, acoustical ratings, and light reflectances, unless otherwise indicated. 1. Mounting Method for Measuring NRC: Type E-400 (plenum mounting in which face of test specimen is 15-3/4-inches [400 mm] away from the test surface), per ASTM E METAL SUSPENSION SYSTEMS, GENERAL A. Standard for Metal Suspension Systems: Provide manufacturer's standard metal suspension systems of types, structural classifications, and finishes indicated that comply with applicable ASTM C 635 requirements. B. Finishes and Colors: Provide manufacturer's standard factory-applied finish for type of system indicated. C. Attachment Devices: Size for 5 times design load indicated in ASTM C 635, Table 1, Direct Hung, unless otherwise indicated. D. Wire for Hangers and Ties: ASTM A 641, Class 1 zinc coating, soft temper. 1. Gage: Provide wire sized so that stress at 3 times hanger design load (ASTM C 635, Table 1, Direct-Hung), will be less than yield stress of wire, but provide not less than inch diameter (12- gage). paint. E. Hanger Rods: Mild steel, zinc coated, or protected with rust- inhibitive F. Flat Hangers: Mild steel, zinc coated, or protected with rust inhibitive paint. Provide where required for loads imposed or attachment methods. G. Edge Moldings and Trim: Metal or extruded aluminum of types and profiles indicated, or if not indicated, manufacturer's standard moldings for edges and penetrations that fit type of edge detail and suspension system indicated.

5 1. For lay-in panels with reveal edge details, provide stepped edge molding that forms reveal of same depth and width as that formed between edge of panel and flange at exposed suspension member. 2. For circular penetrations of ceiling, provide edge moldings fabricated to diameter required to fit penetration exactly. 3. For narrow faced suspension systems, provide suspension system manufacturer's standard edge moldings that match width and configuration of exposed runners. H. Impact Clips: Where indicated, provide manufacturer's standard impact clip system design to absorb impact forces against lay-in panels. I. Retention Clips: At fire-resistance rated assemblies, provide manufacturer s standard retention clips, spaced to comply with requirements of UL designs indicated. PART 3 - EXECUTION 3.01 EXAMINATION A. Examine substrates and structural framing to which ceiling system attaches or abuts, with Installer present, for compliance with requirements specified in this and other sections that affect installation and anchorage of ceiling system. Do not proceed with installation until unsatisfactory conditions have been corrected PREPARATION A. Coordination: Furnish layouts for preset inserts, clips, and other ceiling anchors whose installation is specified in other sections. B. Measure each ceiling area, and establish layout of acoustical units to balance border widths at opposite edges of each ceiling. Avoid use of less-than-half-width units at borders, and comply with reflected ceiling plans INSTALLATION A. General: Install acoustical ceiling systems to comply with installation standard referenced below, per manufacturer's instructions and CISCA "Ceiling Systems Handbook."

6 1. Standards for Installation of Ceiling Suspension Systems: Comply with ASTM C 636 and ASTM E 580. B. Arrange acoustical units and orient directionally patterned units in a manner shown by reflected ceiling plans. C. Suspend ceiling hangers from building structural members and as follows: 1. Install hangers plumb and free from contact with insulation or other objects within ceiling plenum that are not part of supporting structural or ceiling suspension system. Splay hangers where indicated, and where required to miss obstructions and offset resulting horizontal forces by bracing, countersplaying or other equally effective means. 2. Where width of ducts and other construction within ceiling plenum produces hanger spacings that interfere with the location of hangers at spacings required to support standard suspension system members, install supplemental suspension members and hangers in form of trapezes or equivalent devices. Size supplemental suspension members and hangers to support ceiling loads within performance limits established by referenced standards. 3. Secure wire hangers by looping and wire-tying directly to inserts, eyescrews or other devices that are secure and appropriate for substrate, and in a manner that will not cause them to deteriorate or otherwise fail due to age, corrosion, or elevated temperatures. 4. Secure flat, angle, channel, and rod hangers to structure, including intermediate framing members, by attaching to inserts, eyescrews or other devices that are secure and appropriate for structure to which hangers are attached, as well as for type of hanger involved, and in a manner that will not cause them to deteriorate or fail due to age, corrosion, or elevated temperatures. 5. Do not support ceilings directly from permanent metal forms; furnish cast-in-place hanger inserts that extend through forms. 6. Do not attach hangers to steel deck tabs. 7. Do not attach hangers to steel roof deck. Attach hangers to structural members.

7 8. Space hangers not more than 4'-0" o.c. along each member supported directly from hangers, unless otherwise shown, and provide hangers not more than 8-inches from ends of each member. D. Install edge moldings of type indicated at perimeter of acoustical ceiling area and where necessary, to conceal edges of acoustical units. 1. Screw-attach moldings to substrate at intervals not over 16-inches o.c., and not more than 3-inches from ends, leveling with ceiling suspension system to tolerance of 1/8-inch in 12'-0". Miter corners accurately and connect securely. E. Install acoustical panels in coordination with suspension system with edges concealed by support of suspension members. Scribe and cut panels to fit accurately at borders and at penetrations CLEANING 1. Install hold-down clips in Room 402; space as recommended by panel manufacturer, unless otherwise indicated or required. A. Clean exposed surfaces of acoustical ceilings including trim, edge moldings, and suspension members. Comply with manufacturer's instructions for cleaning and touch-up of minor finish damage. Remove and replace work that cannot be successfully cleaned and repaired to permanently eliminate evidence of damage PRODUCT DATA SHEETS A. Provide products indicated on the following Product Data Sheets.

8 ACOUSTICAL PANEL CEILING PRODUCT DATA SHEET Drawing/Schedule Designation: ACT-1 Acoustical Panel Characteristics: Provide panels complying with ASTM E 1264 for characteristics described below: Product/Manufacturer: Type: Color: Minaboard Cortega #769, Armstrong World Industries III, Form 2, Pattern CD (Wet-formed mineral fiber with factory-applied vinyl latex coating) White Light Reflectance Coefficient: 0.80 Noise Reduction Coefficient: 0.55 Ceiling Sound Transmission Class: Minimum 35 Edge Detail: Thickness: Size: Suspension System Type: Armstrong USG Square-cut 5/8-inch 24-inches by 48-inches Prelude 15/16-inch Exposed Tee System, World Industries or DX 26 Exposed Tee System, Interiors, Inc. Color: White

9 ACOUSTICAL PANEL CEILING PRODUCT DATA SHEET Drawing/Schedule Designation: ACT-2 Acoustical Panel Characteristics: Provide panels complying with ASTM E 1264 for characteristics described below: Product/Manufacturer: Minatone Cortega #704A, Armstrong World Industries Type: Color: III, Form 2, Pattern CD (Wet-formed mineral fiber with factory-applied latex paint.) White Light Reflectance Coefficient: 0.80 Noise Reduction Coefficient: 0.55 Ceiling Sound Transmission Class: Minimum 35 Edge Detail: Thickness: Size: Suspension System Type: Exposed Interiors, Inc. Color: Flat indicated on Finish Angled tegular 5/8-inch 24-inches by 24-inches Prelude 15/16-inch Exposed Tee Grid System, Armstrong World Industries, or DX 26 Tee Grid System, USG Black, unless otherwise Schedule. **END OF SECTION**