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FAQ
Turn your HVAC system on and return to the areas where ductwork is accessible. Check the connections between each section of duct, placing your hand over the metal. If you feel air against your hand, the connection is loose and there is an air leak. A common place for leaks is the duct joints.
The test is conducted at 0.1 inches w.g. (25 Pa) with all registers taped or sealed. The 2009 IECC limits leakage to less than or equal to 6 cfm per 100 ft2 of conditioned floor area when the air handler is installed and 4 cfm when it is not installed.
A duct leakage test (duct testing) can be performed at rough-in before drywalling, or post-construction. In both cases, the requirements are the same. The system will need to achieve a leakage rate of less than 4 CFM (cubic feet per minute) per 100 square feet of the home.
As of 2010, Standard 90.1 (addendum cq) dictates that ductwork that is designed to operate at a static pressure greater than 3 in. wg., and all ductwork located outdoors, shall be leak tested, and the maximum permissible leakage shall be determined using a leakage class of 4 for both round and rectangular duct.
2. Specifying air leakage rates not to exceed 5% (sometimes as low as 2.5%) of system design air quantity with test pressures equal to duct design pressure class, and 3.
Duct Leakage Standards If the test results show 15% or higher leakage, the ducts must be repaired until the standard is met. Afterwards, a third party HERS rater (Home Energy Rating Systems) will check that the duct sealing and testing was done properly, and that the leakage is in fact 15% or lower.
R403. 3.3. 1 Total duct leakage. Total duct leakage less than or equal to 4 cfm (113 L/min) per 100 square feet (9.29 m2) of conditioned floor area served by that system when tested at a pressure differential of 0.1 inches w.g. (25 Pa) across the entire system, including the manufacturer's air handler enclosure.
ing to the EPA, the typical home with a forced air HVAC system loses between 20 and 30 percent of its conditioned air due to duct leakage.
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