Common use of Ductwork Clause in Contracts

Ductwork. Fabricate ductwork from a minimum 24-gauge zinc-coated (galvanized) steel, lock forming quality sheets conforming to ASTM A527. Zinc coating thickness: “Commercial” class G90, except a minimum of 2 oz. Per sq. ft. where the metal is exposed to the weather. Ductwork shall be constructed in accordance with SMACNA “HVAC Duct Construction Standards-Metal and Flexible”, first edition 1985. Insulate concealed ductwork with Xxxxx Corning all service duct wrap type 100 with FRK vapor barrier facing or foil backing. Insulate exposed ductwork with rigid board insulation over mechanical fasteners. Insulation shall meet UL-181. Duct insulation shall be installed on all ductwork in unconditioned spaces, and outside air ducts between the louver and air-handling unit. Flexible ductwork and assemblies shall meet the class 1 requirements of NFPA 90A and 90B, and labeled by UL with a flame spread of 25 or less and a smoke development rating of 50 or less, in compliance with UL-181. Flexible ducts shall be limited to a maximum length of 5’ and no section over 2.5’ shall be unsupported. Duct Accessories: Fire dampers shall be installed in all locations as required by building code. Diffusers shall be of the following type and sized to meet demand: Type #1 Key operated opposed blade dampers. Type #2 24” x 24” egg crate return diffusers, for grid type ceiling. (Vestibule location only.)

Ductwork. Fabricate ductwork from a minimum 24-24 gauge zinc-coated (galvanized) steel, lock lock-forming quality sheets conforming to ASTM A527. Zinc coating thickness: “Commercial” class G90, except a minimum of 2 oz. Per per sq. ft. where the metal is exposed to the weather. Ductwork shall be constructed in accordance with SMACNA “HVAC Duct Construction Standards-Standards - Metal and Flexible”, first edition First Edition, 1985. Insulate concealed ductwork with Xxxxx Corning all service duct wrap type 100 with FRK vapor barrier facing or foil backing. Insulate exposed ductwork with rigid board insulation over mechanical fasteners. Insulation shall meet UL-181. Duct insulation shall be installed on all ductwork in unconditioned spaces, and outside air ducts between the louver and air-air handling unit. Flexible ductwork and assemblies shall meet the class Class 1 requirements of NFPA 90A and 90B, and labeled by UL with a flame spread of 25 or less and a smoke development rating of 50 or less, in compliance with UL-181. Flexible ducts shall be limited to a maximum length of 5’ ' and no section over 2.5’ 24” shall be unsupported. Duct Accessories: Accessories Fire dampers shall be installed in all locations as required by building codelocations. Diffusers Return diffusers shall be of the following type and sized to meet demand: Type #1 Key operated opposed blade dampers. Type #2 24” x × 24” egg crate eggcrate return diffusers, for grid type ceiling. Air supply into the office area from the underfloor air distribution system shall be via high induction occupant- controlled floor diffusers, as manufactured by Trox USA, Inc., "FB Series" or equivalent performing product. Temperature Controls: Variations in temperature within each control zone, and between zones, shall not exceed 4oF, with the temperature measured from a reference point 1' inside of any exterior wall to the center of the building. The temperature variation from the floor to a height of 30" for any employee work station (Vestibule location onlyeither conventional desk or systems furnishings) shall not exceed 2oF. Testing shall be made when the exterior temperature has reached a daily peak of 80oF or more for 2 consecutive days.)

Ductwork. Fabricate ductwork from a minimum 24-24 gauge zinc-coated (galvanized) steel, lock lock-forming quality sheets conforming to ASTM A527. Zinc coating thickness: “Commercial” class Class G90, except a minimum of 2 oz. Per per sq. ft. where the metal is exposed to the weather. Ductwork shall be constructed in accordance with SMACNA “HVAC Duct Construction Standards-Standards - Metal and Flexible”, first edition First Edition, 1985. Insulate concealed ductwork with Xxxxx Corning all service duct wrap type 100 with FRK vapor barrier facing or foil backing. Insulate exposed ductwork with rigid board insulation over mechanical fasteners. Insulation shall meet UL-181. Duct insulation shall be installed on all ductwork in unconditioned spaces, and outside air ducts between the louver and air-air handling unit. Flexible ductwork and assemblies shall meet the class Class 1 requirements of NFPA 90A and 90B, and labeled by UL with a flame spread of 25 or less and a smoke development rating of 50 or less, in compliance with UL-181UL 181. Flexible ducts shall be limited to a maximum length of 5’ 5 feet and no section over 2.5’ 2-1/2 feet shall be unsupported. Duct Accessories: Fire dampers shall be installed in all locations as required by building codelocations. Diffusers shall be of the following type and sized to meet demand: Type #1 Grillmaster #CB 404, curved blade registers. Key operated opposed blade dampers. Type #2 Grillmaster #RN-PT series round neck perforated diffuser for grid type ceilings. Type #3 24” x 24” egg crate eggcrate return diffusers, for grid type ceiling. (Vestibule location only.)

Ductwork. Fabricate ductwork from a minimum 24-gauge zinc-coated (galvanized) steel, lock forming quality sheets conforming to ASTM A527. Zinc coating thickness: “Commercial” class G90, except a minimum of 2 oz. Per sq. ft. where the metal is exposed to the weather. Ductwork shall be constructed in accordance with SMACNA “HVAC Duct Construction Standards-Metal and Flexible”, first edition 1985. Insulate concealed ductwork with Xxxxx Corning all service duct wrap type 100 with FRK vapor barrier facing or foil backing. Insulate exposed ductwork with rigid board insulation over mechanical fasteners. Insulation shall meet UL-181. Duct insulation shall be installed on all ductwork in unconditioned spaces, and outside air ducts between the louver and air-handling unit. Flexible ductwork and assemblies shall meet the class 1 requirements of NFPA 90A and 90B, and labeled by UL with a flame spread of 25 or less and a smoke development rating of 50 or less, in compliance with UL-181. Flexible ducts shall be limited to a maximum length of 5’ and no section over 2.5’ shall be unsupported. Duct Accessories: Fire dampers shall be installed in all locations as required by building code. Diffusers shall be of the following type and sized to meet demand: Type #1 Grillmaster #CB 404, curved blade registers. Key operated opposed blade dampers. Type #2 Grillmaster #RN-PT series round neck perforated diffuser for grid type ceilings. Type #3 24” x 24” egg crate return diffusers, for grid type ceiling. (Vestibule location only.)

Ductwork. Fabricate ductwork from a minimum 24-gauge zinc-coated (galvanized) steel, lock forming quality sheets conforming to ASTM A527. Zinc coating thickness: “Commercial” class G90, except a minimum of 2 oz. Per sq. ft. where the metal is exposed to the weather. Ductwork shall be constructed in accordance with SMACNA “HVAC Duct Construction Standards-Metal and Flexible”, first edition 1985. Insulate concealed ductwork with Xxxxx Corning all service duct wrap type 100 with FRK vapor barrier facing or foil backing. Insulate exposed ductwork with rigid board insulation over mechanical fasteners. Insulation shall meet UL-181. Duct insulation shall be installed on all ductwork in unconditioned spaces, and outside air ducts between the louver and air-air- handling unit. Flexible ductwork and assemblies shall meet the class 1 requirements of NFPA 90A and 90B, and labeled by UL with a flame spread of 25 or less and a smoke development rating of 50 or less, in compliance with UL-181. Flexible ducts shall be limited to a maximum length of 5’ and no section over 2.5’ shall be unsupported. Duct Accessories: Fire dampers shall be installed in all locations as required by building code. Diffusers shall be of the following type and sized to meet demand: Type #1 Key operated opposed blade dampers. Type #2 24” x 24” egg crate return diffusers, for grid type ceiling. (Vestibule location only.)