I'm trying to locate the end of a duct that is disconnected from the unit in my attic (don't worry, there's no venting into the attic- it was previously sealed). The problem is the duct is buried under piles of blown-in cellulose insulation. Had an A/C professional crawl around for 1 hour trying to find it with no luck. I'm thinking of using a fog machine to blow in smoke through the vent and find it that way. Is that a good/bad idea? Any alternatives?
Note: Once I find the duct I'm going to hire a pro to replace it!
Thanks in advance!