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Do I really need to close all air ducts except the furthest one away to test for mold in the HVAC unit?

air away ducts Furthest HVAC mold Test
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Do I really need to close all air ducts except the furthest one away to test for mold in the HVAC unit?

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Yes, the test requires a strong volume of air for a few minutes and the air volume is strongest when all of the air ducts but one is closed.

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