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. What is covered? All parts of leaking, broken, or separated ductwork, that is unobstructed and/or fully accessible, and is part of Your cooling system and/or heating system inside Your Home, except those in “What is not covered?” below. 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? • Up to $1,000 per Term (“Benefit Limit”). • Multiple Service Calls up to the Benefit Limit. See “What is a Service Call?” below.
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. 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. 1. Return air is drawn from the heated living space.
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. 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: 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. Ventilation Controls: Minimum 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, 24-hour adjustable timer. Janitor closet exhaust systems shall be on a separate a 7-day, 24-hour adjustable timer. The exhaust system from the server room shall be switched separately from lighting.
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. 3) Equipment and control devices requiring periodic maintenance or repair.
Ductwork should have a watertight seal. The methods used to connect and seal ductwork must accommodate the air pressure or vacuum within the ductwork, maintain a bond to the ductwork and allow the metal to move. When ductwork requires external insulation, a waterproofing jacket or membrane must be installed over the insulation. Building owners should choose insulation and waterproofing combination that provides long-term watertight performance. (Often, simplistic, low-cost solutions can be problematic.) In most cases, a roof membrane or second sheet-metal skin should be used to waterproof the insulation and ductwork – a single-ply membrane with heat-welded seams often is a good choice.
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. NOTE: For appliances and systems over 10 years old, the 12-month limit of liability is $750. If the repair is over $750 or parts are not available to repair the equipment, a replacement allowance equal to the total limit of liability less any paid repair costs will be paid to the customer.
