Flexible Ductwork Clause Samples
Flexible Ductwork. Shall be UL listed when tested in accordance with UL-181, Class I-Standard for Safety of Air Ducts. Duct insulation resistance shall be a minimum of R-6. Flexible duct shall not be less than 4' in length or exceed 8' in length for any individual runout, and shall be supported to prevent collapse or movement. Sections of flexible duct shall not be connected end-to-end.
Flexible Ductwork. Lightweight duct is to include a core of corrosion resistant wire helix permanently bonded within fabric, insulated with 1 1/2” thick, 3/4 lb. density fiberglass flexible insulation and covered with a fire retardant reinforced vapor barrier. Pressure requirements must be minimum 12” positive and 10” negative. Duct must meet NFPA 90A requirements and be listed as Class 1 Air Duct Material, UL Standard 181 and must be as manufactured by Wiremold Company Type WCK, Thermaflex, ▇▇▇▇▇▇▇ Flexmaster or equal as specified. Duct leakage testing should be performed in accordance with ASHRE standards. A maximum of 5’-0” flex duct length must be provided for connection to air distribution devices and be oversized to next largest size required to carry the designated air quantity. All VAV/FPT boxes, exhaust fans, and all vibrating equipment must be suspended with neoprene rubber-in-shear or spring vibration isolators, and must be seismically restrained per Massachusetts State Building Code.
Flexible Ductwork. A. Flexible ductwork shall be factory fabricated assembly of corrosion resistant reinforcing wire helix permanently bonded and enclosed in reinforced aluminum foil/polyester laminate. Duct shall be UL listed 181 Class I and shall comply with NFPA 90A and 90B and all other Governmental Authorities having jurisdiction.
1. Duct material shall be factory wrapped with fiberglass insulation with a C factor of .23 or less. The insulation shall be encased in a fire retardant vapor barrier jacket.
2. Flexible ductwork shall he installed for the following: Project No. C-0019 ▇▇▇▇▇▇▇▇ ▇▇. ▇ ▇▇▇▇▇-▇ ▇▇▇▇▇▇▇ to supply outlets, where indicated. Runouts to exhaust inlets, where indicated. Project No. C-0019 ADDENDUM NO. 1 15890-14
3. Flexible ductwork shall be installed using extra heavy flexible duct straps equal to those manufactured by Catamount Manufacturing Inc.
Flexible Ductwork. A. Connections of flexible ductwork to sheet metal ductwork and/or equipment shall be made in accordance with flexible ductwork manufacturer's recommendations and instructions. Project No. C-0019 ADDENDUM NO. 1 15890-18
1. Maximum length of flexible ductwork shall be W-O".
2. Flexible ductwork shall not penetrate any wall without Architect's approval.