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Contary to popular belief, 'duct' tape is not for fixing broken furnace ducts. It was originally developed for sealing the joints between duct sections, and is a poor substitute for properly riviting the sections together. If you have a large leak in a duct section, you might consider replacing the whole section rather than trying to patch it. If the leak is only a few inches in diameter, cut a piece of sheet metal about the same thickness as the metal of the duct, drill holes 1/8 inch in diameter around the perimeter of this piece, and then lay it on the duct. Using a marker of some sort, mark a few of the holes at one end of the patch, and drill the duct with the same 1/8 inch drill. Using a pop riveting tool, pop rivet the patch to the duct. Work from one end of the patch toward the other, never drilling more than 2 or 3 holes at a time before riveting them. Otherwise, the patch will end up not aligning with the holes that you have drilled, and you will have to make more holes in the duct. If the patch must go over an irregular surface, like an elbow, you may need to use silicone sealant to seal the spaces between the rivets.

Be careful when drilling the duct that you do not press hard on the drill, as it could cause the duct to collapse. If you do not have any of the tools needed to perform this repair, consider calling a heating and air conditioning specialist.

AnswerIt depends on what is wrong with the duct. Could you be more specific?
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Q: How do you repair a furnace duct?
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