Division 22 23 Ebook Page 263 Section 23 31 30 Flexible HVAC Ducts

FLEXIBLE HVAC DUCTS 23 31 30 - 3 Flexible HVAC Ducts a. Metalized, reinforced polyester. b. Reinforced grey polyester. c. Black polyethylene. d. Heavy-duty black polyethylene vapor barrier (4 mil thick), in compliance with HUD requirements for outdoor mobile home or modular home installation. 2.3 ACCESSORY MATERIALS A. Accessories: Provide accessories per flexible duct system manufacturers recommendations, including the following: 1. Air Connectors: Non-insulated, UL 181 air connector, polyester and aluminum foil. 2. Tape: UL 181B-FX. 3. Clamps: a. Metal Clamps: 1/2 in wide aluminum, galvanized steel, or stainless steel. b. Nonmetallic Clamps: UL 181B-C, nylon straps. 4. Mastics: UL 181B-M. PART 3 - EXECUTION 3.1 EXAMINATION A. Verify that materials and accessories can be installed in accordance with Contract Documents and material manufacturers' recommendations. B. Verify, by inspecting product labeling, submittal data, and/or certifications which may accompany the shipments, that materials and accessories to be installed on the project comply with applicable specifications and standards and meet specified thermal and physical properties. C. Before starting work under this section, carefully inspect the site and installed work of other trades and verify that such work is complete to the point where installation of materials and accessories under this section can begin. 3.2 SAFETY PRECAUTIONS A. Insulation contractor's employees shall be properly protected during installation of insulation. Protection shall include proper attire when handling and applying insulation materials, and shall include, but not be limited to, disposable dust respirators, gloves, hard hats, and eye protection. 3.3 INSTALLATION A. Install flexible duct systems, including connections and joints, in accordance with manufacturers installation instructions, ADC Flexible Duct Performance and Installation Standards Chapter 4 Installation Requirements, and with UL 181, Class 1 Air Duct. B. Support flexible ducts at manufacturers recommended intervals, but not greater than 5 ft., by use of hanging devices, approved by local authorities having jurisdiction. Do not allow sag of greater than 1/2 in per foot of spacing between supports. C. Install flexible connectors to connect ducts to equipment. D. Seal penetrations and tears in vapor barrier with tape.

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