Originally Posted by
Trex
Sorry for delay Aspie , sometimes a pin hole/thin cracks in a duct can make a whistling noise check for that . GEt a propane torch and lighter and use that place unlit propane torch near intake in duct open full pin , then take lighter and check for the leak . No no just kidding dont use a torch LMFAO PMSL
Sometimes i need to punch holes in ducts to verify peoples furnaces and ventilation to check drafts and temperatures , and sometimes i foget to tape it up and people complain theres a whistle afterwards , Blocked intake can do it also , clean that sock off , and pass a vacuum lightly over your filter ..... lets eliminate one thing at a time .
Also , short radius bends can make noises also . i like to make bends and turns 4x pipe radius when possible .
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