tiny hole in 6" duct pipe

Old 07-20-19, 01:10 PM
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tiny hole in 6" duct pipe

I was passing some co-axial cables through some existing holes drilled through my floor joists when I noticed a spot where two holes were drilled. On the other side of one of the holes is a 6" duct pipe and there is a tiny hole in it (approximately 1/32") I'm guessing from the drill bit used to drill the hole. When I put my finger to the hole I feel cold air coming out (AC is on). What is the best way to plug this hole? I'm sure the best way is to replace this section of pipe, but it looks like it would be a real pain in the a**.

The photo below doesn't show the hole. It just shows the duct pipe.
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Old 07-20-19, 01:16 PM
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Foil tape........................................
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Old 07-20-19, 03:29 PM
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Probably a mis-drilled screw hole, if you can get to it maybe screw a short sheet metal screw into it. And seal it with a little silicone sealer on the screw before installing it.
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Old 07-20-19, 03:43 PM
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Foil tape or duct mastic is often used to seal all junctions and seams in ducting, especially when those leak areas are outside the conditioned living space. If this area is conditioned then leakage is less important but sealing it does go in the right direction.

Looking closely at that picture is that a junction just above the orange wire and it doesn't look to be sealed. A roll of foil tape for the newly discovered hole could take care of some of the other seams and junctions.

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