It appeared in chapter 10 of the high velocity later high pressure construction standards and in chapter 8 of the balancing and adjustment of air distribution systems manual of 1967 vintage. Contains updates to the expected leakage rates for ductwork constructed to the smacna hvac duct construction standards metal flexible duct leakage test procedures recommendations on use of leakage testing types of test apparatus and test setup and sample leakage analysis. Smacna has published a procedure for leakage testing of so called medium and high pressure ductwork since january 1965.
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