Leaky Flex Ducts | Air Leak Testing Equipment Problems

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I have a pinhole leaking flex duct that connects the ducTester to the return.  What should I do?

Answer

​One question we get a lot is about leaking flex duct that connects the ducTester to the return. We have tested the most ripped up flex available in our warehouse; it had way bigger pinholes and it measured 0.68 CFM at 25 Pa. When you measure a typical leakage of 100 CFM at 25 Pa or more, this is not even 1%.  So we believe it is not worth spending money on replacing.