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You can choose which method might work best for you and your situation The “total” duct leakage test measures how much air leakage there is for all of the ductwork connected to the hvac system, including ducts located both outdoors and indoors. Look for obvious leaks, tears or separations in the ductwork.
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Two kinds of duct leakage, of course, require two types of tests The 2009 iecc limits the leakage to outdoors to less than or equal to 8 cfm per 100 ft 2 of conditioned floor area or total leakage less than or equal to 12 cfm per. The malignant leaks occur in ducts that are outside of the conditioned space, or outside the building envelope, in building science jargon, so the most important test is called the ‘outside leakage test’ or the ‘leakage outside the envelope test.’
