Hvac air duct leakage test manual rs 35 10 cfr 434 403 2 9 3 sheet metal and air conditioning contractors national association smacna approved. Schedule the pressure classes here by fan system num ber or portion thereof if they are not shown on the drawings. Figure 5 1l from the 2012 smacna hvac air duct leakage test manual shows the allowable leakage as a function of duct leakage classification and static pressure in the duct.
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