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. 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:
Ductwork. Includes Duct from heating unit to point of attachment at registers or grills, NOT COVERED: Registers and grills; insulation; asbestos-insulated ductwork; vents; flues and breaching; ductwork exposed to outside elements; improperly sized ductwork; separation due to settlement and/or lack of support; damper motors; diagnostic testing of or locating leaks to ductwork. We will provide access to ductwork through unobstructed walls, ceilings or floors, only, and will return the access opening to rough finish condition. With respect to concrete covered, embedded, encased, or otherwise inaccessible ductwork, We will pay $500.00 per contract term for access, diagnosis and repair or replacement. Our authorized Service Provider will close the access opening and return to a rough finish condition, subject to the $500.00 limit indicated. We shall not be responsible for payment of the cost to remove and replace any built-in appliances, cabinets, floor coverings or other obstructions impeding access to walls, ceilings, and/or floors.
Ductwork. What is covered? What is not covered? Registers; grilles; dampers; insulation; crushed, pest damaged or asbestos-insulated ductwork. See also “Additional Exclusions”. What is the maximum amount We will pay for Covered Repairs?
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. COVERED: Accessible Ductwork from Cooling and/or Heating Unit to Point of Attachment to Registers or Grills. NOT COVERED: Insulation; asbestos covered ductwork; registers; grills; dampers; improperly sized ductwork; diagnostic testing of, or locating leaks to ductwork, including as required by any law, regulation, ordinance or code or when required due to the installation or replacement of system equipment; ductwork outside the perimeter of the home or crawl space; collapsed or crushed ductwork; ductwork damaged by moisture or rodents. We will only repair unobstructed and accessible ductwork. Obstructions include, without limitation, walls, floors, ceilings, built-in appliances, systems, and cabinets.
Ductwork. Return air is drawn from the heated living space.
Ductwork. All supply ductwork to be metal with 1" wrap insulation and/or insulated duct liner. Branch takeoffs from supply air mains to be a minimum of 5'-0" in length. Flexible ductwork may be utilized for drops but shall not exceed 10'-0" in length. Provide balancing dampers as necessary. All bends to have turning vanes.
Ductwork. COVERED: Accessible ductwork from covered unit to point of attachment on register/grill. NOT COVERED: Concrete encased or inaccessible ductwork.
Ductwork. 1. All new ductwork per the [SMACNA guide].
2. Supply Duct sizing based on pressure drops of 0.15” per 100’
3. Exhaust Duct sizing based on pressure drops of 0.2” per 100’
a. 8’ - Maximum Flex Duct run
Ductwork. All ductwork shall be fabricated from galvanized sheet steel in accordance with the best recommended practices of the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) and in strict compliance with all the applicable standards of the Sheet Metal and Air Conditioning contractors National Association (SMACNA), latest editions. Branches from the main low velocity trunk ductwork shall be furnished with splitter dampers or similar balancing devices in general accordance with the latest standards of the Associated Air Balance Council. Access panels are required for these devices in ceilings. All supply and outside air ductwork shall be insulated with one (1) inch thick glass fiber insulation with foil vapor barrier, except those portions which are lined for acoustical purposes and supply air ductwork within air conditioned spaces (not return air plenums).
