SECTION 15910 DUCT ACCESSORIES PART 1 GENERAL 1.01 SUMMARY A. Related Sections: 1. 15890 - Ductwork. 2. 15900 - Controls and Instrumentation. 3. 15940 - Outlets (HVAC). 4. 15970 - HVAC Control System. 1.02 REFERENCES A. Sheet Metal and Air-conditioning Contractors National Association (SMACNA): Low and High Velocity Duct Manuals. B. National Fire Protection Association (NFPA) 90-A Standard for the Installation of Air-conditioning and Ventilating Systems of Other Than Residential Type. 1.03 SUBMITTALS A. Duct Access Doors: Catalog cuts. B. Volume Dampers: Shop drawings. C. Fire Dampers: Catalog cuts. D. Low Pressure Ductwork Round Fittings: Shop Drawings or catalog cuts. E. Flexible Connections: Catalog cuts. F. Test Holes: Pipe couplings, catalog cuts, and proposed installation locations. PART 2 PRODUCTS 2.01 EQUIPMENT A. Volume Dampers: 1. Dampers shall be manual or automatic as indicated on drawings. Dampers furnished with automatic actuators shall be furnished under Section 15900 and installed Project No. SPECIFICATION GUIDELINES 15910-1
under this section. 2. Volume dampers shall have opposed blades. 3. Volume dampers shall be 2 gages heavier than the installed duct and shall be reinforced to prevent vibration and noise. a. Dampers shall be according to SMACNA "Low Velocity Manual", as referred to in "Ductwork". Dampers shall have an indicating device with lock to hold damper in position for proper setting. b. Splitter dampers shall be double thickness at the leading edges. c. Volume dampers shall be fabricated according to Figure 2-12 of SMACNA Low Pressure Manual. 4. Bridge lock type quadrant operators of dampers shall mount flush with surface of duct insulation. B. Motor Operated Dampers: 1. Motor operated dampers for 100 percent outside air and smoke shall be minimum leakage Arrow-Foil Damper No.OBDAF-207 as manufactured by the Arrow Louver and Damper Corp., Maspeth, NY 11378. 2. Frames and blades shall be minimum 12 gage (0.081") extruded aluminum: Blades shall be single unit Arrow- Foil design, 6 inches wide, with Pin-Lock an integral section within the blade core. 3. Frames shall be a combination of 4 inch extruded aluminum channel and angle with reinforcing bosses and groove inserts for vinyl seals. 4. Minimum size dampers shall have 2 inch X 5/8" aluminum frames. 5. Pivot rods shall be 1/2" diameter extruded aluminum, Pin-Lock design interlocking into blade section. Bearings to be "Double-Sealed" type with Celcon inner bearing on rod riding in Merlon Polycarbonate bearing inserted in frame so outer bearing cannot rotate. 6. Rod bearings shall be designed with no metal-to-metal or metal-to-bearing riding surfaces. Interconnecting linkage shall have a separate Celcon bearing to eliminate friction in linkage. 7. Blade linkage hardware shall be installed in angle or channel frame section out of air stream. Hardware shall be of non-corrosive reinforced material or cadmium plated. 8. Dampers shall be engineered for minimum air leakage by means of overlapping design and by extruded vinyl seals to fit into integral ribbed grooved inserts in both frames and blades. All dampers over 10 square feet free Project No. SPECIFICATION GUIDELINES 15910-2
area shall have reinforced corners by means of gusset plates. 9. Opposed blade dampers, when closed, shall have less than 3/4 of 1 percent leakage at 5 inches and less than 1 percent at 9 inch WG static pressure. C. Flexible Connectors: Size flexible connections at a minimum of 4 inches between connected items. Provide 30 ounce glass fabric fire retardant and air tight, coated with neoprene on both sides. Ventglass by Ventfabrics, Inc. or Neoprene Fabriduct by Elgen. D. Fire Dampers: Provide approved fire dampers where indicated on drawings. Dampers shall be constructed and installed according to requirements of NFPA 90A, and each damper shall be provided with fusible link designed to melt at 165 degrees F. Damper blades shall be stacked outside of air stream. 1. Manufacturers: a. Action Air Incorporated. b. Air Balance. c. National Control Air. d. United Sheet Metal Company, Series 200. E. Combination Smoke and Fire Dampers: 1. Damper shall bear a 1-1/2 hour UL fire damper label. Dampers shall be constructed of steel, with parallel blades. 2. Damper shall meet requirements specified for fire dampers and include operating shaft able to rotate 90 degrees and cause damper to operate between closed and open. Operating shaft and damper combination shall be suitable for linking to and operation by any standard pneumatic damper operator having sufficient torque characteristics. 3. Dampers shall be installed in 14 gage steel sleeves. F. Duct Access Doors: 1. Access doors shall be hinged except where sliding or removable type is required and shall be insulated except in noninsulated ductwork and casings. Access doors shall be sized for proper access but shall not be less than 16 inches X 12 inches in size, except in small ductwork where a smaller door may be used. Project No. SPECIFICATION GUIDELINES 15910-3
2. Access doors for high pressure ducts shall be galvanized steel with dogs or cams, solid neoprene gaskets, moisture resistant and airtight. Provide door frames to extend over casing or duct insulation. Doors shall operate from outside. Size and construct for high pressure application. PART 3 EXECUTION 3.01 INSTALLATION A. Flexible connections shall be provided as shown on drawings. Lengths shall be between 3 feet and 8 feet. B. Fire Dampers: 1. Fire dampers shall be furnished and installed in duct openings and return air openings through fire partitions and as shown on drawings. 2. Seal around fire dampers with therma-fiber at walls per UL and NFPA requirements. 3. Install dampers as shown on drawings and according to manufacturers recommendations. C. Low pressure ductwork round fittings shall be installed as shown on drawings and according to manufacturers recommendations. D. Provide test holes at mains and main branches and as required by test and balance contractor. E. Duct Access Doors: 1. Airtight, hinged access door with catch shall be installed next to fire dampers and shall be sized for easy inspection or maintenance of dampers. Minimum access door size shall be 18 inches X 18 inches, except in smaller ductwork where a smaller door may be used. 2. Do not obstruct access doors with piping, conduits, hangers, braces, and other ducts. 3. Required ceiling access panels for areas other than removable ceilings shall be furnished under this section for installation under the general construction work. 4. Provide access doors on linkage side of automatic dampers, including fire and smoke dampers. Project No. SPECIFICATION GUIDELINES 15910-4
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