AIR DUCT ACCESSORIES

Transcription

1 SECTION PART 1 GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section Includes: I. Backdraft dampers. 2. Manual volume dampers. 3. Fire dampers. 4. Combination fire and smoke dampers. 5. Flange connectors. 6. Turning vanes. 7. Duct-mounted access doors. 8. Flexible connectors. 9. Flexible ducts. 10. Duct accessory hardware. 11. Louvers B Related Sections: 1. Division 23 Section "HVAC Fans" for roof-mounted ventilator caps. 2. Division 26 Section " Fire Alarm System (Addressable, Simplex/Grinnell)" for ductmounted fire and smoke detectors. 1.3 QUALITY ASSURANCE 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 AMCA 500-D testing for damper rating. 1.4 EXTRA MATERIALS A. Furnish extra materials that match products installed and that are packaged with protective covering for storage and identified with labels describing contents. 1. Fusible Links: Furnish quantity equal to 10 percent of amount installed

2 PART 2 - PRODUCTS 2.1 MATERIALS A. 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. B. Galvanized Sheet Steel: Comply with ASTM A 653/A 653M. 1. Galvanized Coating Designation: [G60 (Z180)] [G90 (Z275)]. 2. Exposed-Surface Finish: Mill phosphatized. C. Stainless-Steel Sheets: Comply with ASTM A 480/A 480M, Type 304, and having a No. 2 finish for concealed ducts and No. 2 finish for exposed ducts. D. Aluminum Sheets: Comply with ASTM B 209 (ASTM B 209M), Alloy 3003, Temper H14; with mill finish for concealed ducts and standard, 1-side bright finish for exposed ducts. E. Extruded Aluminum: Comply with ASTM B 221 (ASTM B 221M), Alloy 6063, Temper T6. F. Reinforcement Shapes and Plates: Galvanized-steel reinforcement where installed on galvanized sheet metal ducts; compatible materials for aluminum and stainless-steel ducts. G. Tie Rods: Galvanized steel, 1/4-inch (6-mm) minimum diameter for lengths 36 inches (900 rm) or less; 3/8-inch (1 0-mm) minimum diameter for lengths longer than 36 inches (900 mm). 2.2 BALANCING DAMPERS A. Balancing dampers for rectangular ductwork shall be opposed blade type, and shall be Ruskin Model MD35 Manual Balancing Damper with Locking Quadrant or equivalent for duct pressure ratings 2 inches w.g. or less, and Ruskin Model CD30AF 1 with Locking Quadrant or equivalent for duct pressure ratings greater than 2 inches w.g. B. Balancing dampers for round ductwork shall be Ruskin Model MDRS25 Round Manual Balancing Damper with Locking Quadrant, or equivalent. 2.3 FIRE DAMPERS A. Fusible link dampers shall be of the folding blade type, shall meet the requirements of NFPA Bulletin 90A, and shall be UL listed and tested in accordance with UL 555 test criteria. Provide fire dampers UL listed for installation in 1-1/2 hour or 2-hour fire separations or divisions. B. Fire dampers for vertical installation shall be gravity operated. Fire dampers for horizontal installation shall have closure springs and latches

3 C. Fire dampers shall have resettable reusable fire link rated at 165 F. November 23,2011 D Fire dampers installed in ductwork shall be Ruskin Model IBD2, Style C, CR, or CO to match duct shape, or equivalent. Maximum pressure drop: 0.05 inches w.g. at 1500 fpm face velocity. E. Equivalent manufacturers: Ruskin, Prefco, National Control Air, Safe-Air, Greenheck, Pottorff. 2.4 DUCT ACCESS DOORS A. In general, access doors shall be at least 18 inches x 18 inches where physically possible; access doors for fire dampers shall be sized in accordance with the fire damper size. B. Access doors shall be of double construction and shall be gasketed around the entire perimeter to minimize air leakage between door and frame. Access doors in insulated ducts or casings, and fire damper access doors, shall be fully insulated with rigid fiberglass insulation between the metal panels. C. In no case shall access to any items of equipment require the removal of nuts, bolts, screws, wedges or any other loose devices. D. Access doors installed in ductwork 2 inches w.g. class and below shall be Ruskin Model ADH22, or equivalent. E. Access doors installed in ductwork above 2 inches w.g. class shall be Ruskin Model ADHP-3 High Pressure Access Doors, or equivalent. 2.5 FLEXIBLE CONNECTIONS A. Flexible connections shall be a minimum of 8 inches long. B. Flexible connection shall be fabricated from approved flameproofed fabric in accordance with the applicable sections of the NFPA overall fire codes. Asbestos cloth is not permitted. 2.6 BACKDRAFT DAMPER A. Damper shall be pressure activated, vertical air flow with face linkage and an adjustable counter weight, with a range of positive pressure from.05 inches to.25 inches w.g. B. Frame shall be constructed of.090 inch thick extruded aluminum. Blades shall be formed from.025 inch aluminum. Blades shall have overlapping edges with extruded vinyl edge seals. C. Damper shall be Ruskin Model CBD2, or equivalent. 2.7 COMBINATION FIRE AND SMOKE DAMPER A. Maximum pressure drop for damper assembly shall be 0.05 inches w.g. at 1500 fpm duct face * velocity

4 B. Dampers shall be UL listed and tested in accordance with UL 555 test criteria and shall be further qualified under UL 555S as a leakage rated damper for use in smoke control systems. The leakage rating shall be no higher than class 1 (4 cfm/sq.ft. at 1 inch w.g.) at 250'F elevated temperature category. UL leakage ratings shall apply to sizes of dampers required herein, and elevated temperature ratings shall apply to operators as well as dampers. C. Each combination fire and smoke damper shall be equipped with a UL classified firestat which shall function to close damper when duct temperature exceeds 165'F. Firestat package shall include two damper position indicator switches, both linked directly to a damper blade, to provide capabilities of remotely indicating damper position. Firestat and damper position indicators shall have capability of interfacing electrically with smoke detectors, building fire alarm systems and remote indicating/control stations. Motor operator shall be 120 volt electric actuated normally closed. D. Motor damper and firestat assembly shall have maximum draw of 4.0 amps. E. Firestat position indicator shall have capabilities of electrically locking damper in a closed position whenever duct temperatures exceed 165 F and the capability of permitting appropriate authority to override the smoke detector and re-open damper as may be required to permit desired smoke control functions only. Damper shall remain closed when firestat temperature is above 165 F. F. Combination motor/fire dampers shall be Ruskin FSD60 or equivalent. G. Firestat shall be Ruskin Model TS 150 or equivalent. H. Equivalent manufacturers: Ruskin, Prefco, National Control Air, Safe-Air, Greenheck. 2.8 DUCT PRESSURE RELIEF DOOR A. Duct pressure relief doors shall be equivalent to Ruskin PRD 18 pressure relief door. Door shall be 12 gauge galvanized steel with polyurethene foam seal, adjustable to relieve pressures from 3 inches to 8 inches positive or negative. 2.9 LOUVERS A. Louvers shall be stationary drainable blade type constructed of extruded aluminum. B. Louver frame shall be 6 inches deep box type. C. Louver frame shall be constructed of inch (minimum) thick aluminum. D. Louver blades shall be inch thick aluminum. E. Louvers shall have an integral color anodized finish. Color shall be selected and approved by Architect. F. Provide aluminum bird screen

5 G. Provide extended sill and clip angles for each louver. November 23,2011 IT Manufacturers: Ruskin, National Control Air, American Warming THERMOMETERS A. Thermometer shall be Ashcroft 5 inch dial thermometer, 20'F to 120'F temperature scale, 9 inch stem length TURNING VANES 1. Ductmate Industries, Inc. 2. Duro Dyne Inc. 3. METALAIRE, Inc. 4. SEMCO Incorporated. 5. Ward Industries, Inc.; a division of Hart & Cooley, Inc. B. Turning Vanes for Metal Ducts shall be 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. C. Manufactured turning vanes for nonmetal ducts shall be fabricated of curved blades of resinbonded fiberglass with acrylic polymer coating; support with bars perpendicular to blades set; set into vane runners suitable for duct mounting. D. Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible"; Figures 2-3, "Vanes and Vane Runners," and 2-4, "Vane Support in Elbows." E. Single wall vane construction. F. Vane Construction shall be single wall for ducts up to 48 inches wide and double wall for larger dimensions FLEXIBLE DUCTS A. Noninsulated, flexible duct shall be UL 181, Class 1, multiple layers of aluminum laminate supported by helically wound, spring-steel wire. 1. Pressure Rating: 10-inch wg (2500 Pa) positive and 1.0-inch wg (250 Pa) negative. 2. Maximum Air Velocity: 4000 fpm (20 m/s). 3. Temperature Range: Minus 20 to plus 210 deg F (Minus 29 to plus 99 deg C)

6 B. Insulated, flexible duct shall be UL 181, Class 1, multiple layers of aluminum laminate supported by helically wound, spring-steel wire; R-6 fibrous-glass insulation; polyethylene aluminized vapor-barrier film. 1. Pressure Rating: 10-inch wg (2500 Pa) positive and 1.0-inch wg (250 Pa) negative. 2. Maximum Air Velocity: 4000 fpm (20 m/s). 3. Temperature Range: Minus 20 to plus 210 deg F (Minus 29 to plus 99 deg C). C. Flexible Duct Connectors: 1. Clamps: Stainless-steel band with cadmium-plated hex screw to tighten band with a worm-gear action in sizes 3 through 18 inches (75 through 460 mm), to suit duct size and adhesive mastic. D. Equivalent manufacturers: Flexmaster U.S.A., McGill AirFlow LLC 2.13 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 and in NAIMA AH 116, "Fibrous Glass Duct Construction Standards," for fibrous-glass ducts. B. Install duct accessories of materials suited to duct materials; use galvanized-steel accessories in galvanized-steel and fibrous-glass ducts, stainless-steel accessories in stainless-steel ducts, and aluminum accessories in aluminum ducts. 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. Where dampers are installed in ducts having duct liner, install dampers with hat channels of same depth as liner, and terminate liner with nosing at hat channel. 1. Coordinate subparagraphs below with Division 23 Section "Metal Ducts." Install steel volume dampers in steel ducts. 2. Install aluminum volume dampers in aluminum ducts

7 E. Set dampers to fully open position before testing, adjusting, and balancing. November 23,2011 F. Install test holes at fan inlets and outlets and elsewhere as indicated. G. Install fire and smoke dampers according to UL listing. H. 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. Downstream from manual volume dampers, control dampers, turning vanes, and equipment. 3. 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. 4. At each change in direction and at maximum 50-foot spacing. 5. Upstream of turning vanes. 6. Elsewhere as indicated. I. Install access doors with swing against duct static pressure. J. 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. K. Label access doors according to Division 23 Section "Identification for HVAC Piping and Equipment" to indicate the purpose of access door. L. Install flexible connectors to connect ducts to equipment. M. For fans developing static pressures of 5-inch wg (1250 Pa) and more, cover flexible connectors with loaded vinyl sheet held in place with metal straps. N. Connect terminal units to supply ducts directly or with maximum 12-inch (300-mm) lengths of flexible duct. Do not use flexible ducts to change directions. 0. Connect diffusers or light troffer boots to low-pressure ducts directly or with maximum 60-inch (1500-mn) lengths of flexible duct clamped or strapped in place. P. Connect flexible ducts to metal ducts with liquid adhesive plus tape. Q. Install duct test holes where required for testing and balancing purposes. is

8 R. Install thrust limits at centerline of thrust, symmetrical on both sides of equipment. Attach thrust limits at centerline of thrust and adjust to a maximum of 1/4-inch (6-mm) movement during start and stop of fans. 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. 3. Operate fire, smoke, and combination 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. 5. Operate remote damper operators to verify full range of movement of operator and damper. END OF SECTION