Where no specific duct pressure class designations are provided byclass designations are provided by the designer the 1 water gage pressure class is the basis of compliance 2011 tsi incorporated prior to field testingprior to field testing. This american national standard ansi smacna 016 2012 covers revised leakage criteria and builds on the proven methods for testing ductwork for air leaks from the first edition. Duct leakage class consult the hvac air duct leakage test manual and select appropriate allowable leakage.
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