I have one of those cheapo Android cameras, they work well, looking into my duct I found a chunk of ducting missing behind the tv and the wiring going down the wall to the breaker box,, also there is a vent pipe through the side of the duct, dont know how I will seal that, I used expanding foam and 2x2 AC foam and also retaped my AC unit ( the tape between intake and exhaust was blown out, and AC wires were inside duct causing whatever,,, the Ac unit to duct work opening is very small too... plus they didnt seal the foam in ceiling to the ceiling joints and my AC comes out everywhere, lights, skylights etc,, gave up chasing and plugging holes for now..
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