Ductwork that is designed to operate at static pressures in excess of 3 inches water column 0 75 kpa and all ductwork located outdoors shall be leak tested according to the ansi smacna hvac air duct leakage test manual. Hvac air duct leakage test manual author. Quote fromquote from hvac air duct leakage testhvac air duct leakage test manual smacna.
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