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 24” shall be unsupported. Duct Accessories Fire dampers shall be installed in all required locations. Return diffusers shall be of the following type and sized to meet demand: 24” × 24” 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 (either 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 gauge zinc-coated (galvanized) steel, lock-forming quality sheets conforming to ASTM A527. Zinc coating thickness: “Commercial” class 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 The 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 24” shall be unsupported. Duct Accessories Accessories: Fire dampers shall be installed in all required locations. Return diffusers shall be of the following type and sized to meet demand: 24” × 24” 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 Ventilation Controls: Variations in temperature within each control zoneMinimum outside air volumes shall be maintained at all times with minimum limits on outside air dampers. Enthalpy based economizer controls shall be included to provide free cooling during the spring and fall. Continuous air circulation and exhaust shall be provided during occupied hours. Exhaust systems for the toilet rooms shall be controlled on a 7-day, and between zones24-hour adjustable timer. Janitor closet exhaust systems shall be on a separate a 7-day, shall not exceed 4oF, with the temperature measured from a reference point 1' inside of any exterior wall to the center of the building24-hour adjustable timer. The temperature variation exhaust system from the floor to a height of 30" for any employee work station (either conventional desk or systems furnishings) shall not exceed 2oF. Testing server room shall be made when the exterior temperature has reached a daily peak of 80oF or more for 2 consecutive daysswitched separately from lighting.

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 Class G90, except a minimum of 2 oz. per sq. ft. where the metal is exposed to the weather. Laboratory ductwork shall withstand the effects of the laboratory nitric acid solution. 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 The 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 24” shall be unsupported. Duct Accessories Accessories: Fire dampers shall be installed in all required locations. Return diffusers shall be of the following type and sized to meet demand: 24” × 24” 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 (either 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.