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Blog Title: Can a fog machine be used to test ducts?
Can a fog machine be used to test ducts?
Category: Central Heat And Air Post By: Joel Nelson (Norfolk, VA), 09/13/2016

Yes, it can. You have to close all the registers with tapes. The duct is pressurized. Then a fog machine is introduced in the ducts, aiming the fog nozzle at the fan blades, without letting the fog get drawn into the vent holes in the motor. You have to watch for where the fog pours out. The site where it pours out is a site of leakage.

- Dennis J. (Austin, TX), 09/17/2016
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