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. I did add some glaze effects and such for this result (it's what I do). Not really a painter as folk here already know, but do like the effects that the new FP 4 have. Ductwork shall be leak-tested in accordance with the SMACNA HVAC Air Duct Leakage Test Manual. 1 month ago 3 After over a year missing FP on my new PC, decided to finally splurge. 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: With UL 181, and shall be installed in accordance with the
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