Apparent differences of about ten percent between fan delivery and sum of airflow measurements at terminals do not necessarily mean poor sealing and excess leakage.
Hvac duct leakage test manual.
The hvac air duct leakage test manual has been incorporated by reference and is legally mandated by the united states in title 10 of the code of federal regulations section 434 403 2 9 3.
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.
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.
Hvac air duct leakage test manual order no.
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.
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Potential accuracy of flow measurements should be evaluated.
The hvac air duct leakage test manual has also been incorporated by reference and is required by law in title 19 new york.
1972 2 nd edition 2012 122 pages.
The research also led to the development of the smacna hvac air duct leakage test manual 1st edition.