How to find the location of a hole in duct work

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Old 01-05-17, 08:56 PM
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How to find the location of a hole in duct work

My house was built in the 1980s and has one furnace/ac for the basement/first floor and a second furnace/ac for the 2nd floor. Back in 2004, we had the 2nd floor furnace/ac replaced and the duct work insulated. Everything was fine until a few years ago when we started to notice the blown in fiberglass insulation showing up in the filter. Recently, it's gotten that bad where a huge pile got past the filter and got jammed in the A coil. My dad and I had to dismantle the furnace and clean it out. Besides that, mice that get into our attic are falling into the air return via the same hole and can get out of the filter area. They can manage to lift the cover and get out. This just needs to stop. How can I determine where the hole is in the duct work and how would I patch it. Thanks!
 
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Old 01-05-17, 09:12 PM
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As a guess it sounds like the hole you are looking for is in the attic..... especially getting insulation in there. How or where to find it..... that's going to be pretty difficult.

I'm thinking some type of controlled smoke.
 
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Old 01-06-17, 05:01 AM
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I was thinking about renting a pipe inspection camera and running it along the return duct. Although the issue I foresee is that it won't slide nicely in the flexible duct work. Although my dad is thinking about replacing it with the round metal duct work and insulating it.
 
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