![]() ![]() Test pressure, which shall be equal to the design duct pressure class rating, inch water column (kPa). Six, duct leakage class, (ft 3/min)/100 square feet duct surface area at 1 inch water column (0.2 kPa). Maximum permitted leakage, (ft 3/min)/100 square feet duct surface area. The permitted duct leakage shall be not more than the following: L max = C LP 0.65 (Equation 603.10.1) Where: Positive pressure leakage testing shall be permitted for negative pressure ductwork. Sections shall be selected by the building owner or designated representative of the building owner. Where the tested 40 percent fail to comply with the requirements of this section, then 100 percent of the total installed duct area shall be tested. Where the tested 10 percent fail to comply with the requirements of this section, then 40 percent of the total installed duct area shall be tested. Representative sections totaling not less than 10 percent of the total installed duct area shall be tested. Ductwork shall be leak-tested in accordance with the SMACNA HVAC Air Duct Leakage Test Manual. Fittings for attaching non-metallic ducts shall be beadedĪnd have a collar length of not less than 2 inches (51 mm).Manufacturer's installation instructions. ![]() Screws shall not penetrate the inner liner of non-metallicįlexible ducts unless permitted in accordance with the.Duct bends shall be not less than one duct diameter bend.(38 mm) wide at point of contact with the duct surface. Supports shall be rigid and shall be not less than 1 1/ 2 inches.(12.7 mm) per foot (305 mm) of support spacing. Sag between support hangers shall not exceed 1/ 2 inch.Vertical risers shall be supported at not more than 6 feet.Horizontal duct runs shall be supported at not more than.Ducts shall be installed using the minimum required.Manufacturer's installation instructions and SMACNA HVACĭuct Construction Standards-Metal and Flexible.įlexible air duct installations shall comply with the following: From stamped and gored 90- and 45-degree elbows to reducers, couplers, saddle tabs and Gripple for hanging, we have you covered.With UL 181, and shall be installed in accordance with the We also carry a range of accessories to make setup easy. The galvannealed steel is great if you are looking for a matte finish or want to paint your spiral. We use G90 galvanized or galvannealed steel in 22-28 gauge options. No matter the configuration, all of our spiral duct is fabricated to meet or exceed the 2005 standards from the Sheet Metal and Air Conditioning Contractors' National Association (SMACNA). Flange connection is also available for smaller diameters. For 22 to 40 inches, we offer flanged fittings with an optional outer ring for quick installation. Fittings from 4-20 inches come standard with a gasketed connection. Note : Mobile Machine is available where the quantities and location warrants. Fittings: We can create gasketed or flanged spiral duct fittings in our Pittsburgh facility. A double-walled thermal insulated spiral duct consists of an external pressure tight metal shell, a 12.5/25 /50mm thick of fiberglass / mineral wool / puf insulation and an internal protective metal liner.Insulation: Internal Insulation thicknesses can be 1 inch, 1 1/2 inches or 2 inches.Coating: We offer powder coating in a variety of colors.Length: Ducts are available in standard 10-foot lengths, but we can also custom-cut lengths from 12 inches up to 20 feet.Diameters: Galvanized and galvanneal versions come in diameters from 4-40 inches, while the double-beaded version has diameters from 10-38 inches.We have several options available for spiral duct fabrication: The spiral HVAC duct products at HMF Duct are available in regular galvanized, galvanneal (Paint Grip) and double-beaded varieties. Spiral Air Duct in Pittsburgh - Available for Pick Up or Delivery ![]()
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