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Duct Blaster Test

The most common method for testing the tightness of a duct system is the duct-blower test (also known as the Duct Blaster test). A duct blower resembles a miniature blower door. All supply registers and return grilles are sealed with polyethylene and tape. The air handler fan is turned off. The Duct Blaster is set up and attached to the duct system (near the furnace or at a large return-air grille). Then the manometer’s reference probe is inserted in the air handler plenum. The Duct Blaster is turned on to pressurize the duct system to 25 Pascals (a pressure which represents typical operating pressures for forced-air systems). The airflow through the Duct Blaster fan equals the flow escaping through leaks in the duct system. Then the results are reported as “cfm @ 25 Pascals” or “cfm25”. “Leakage ranges from less than 50 cfm25 for a fairly tight duct system to more than 500 cfm25 for a very leaky duct system.”

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