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Thanks... will do. Looks like the tape has the same fire reaction rating as the sheets (b-s3, d0), so will probably go that route given minimal clearance.

Nope... Wisconsin.

I don't have a pic inside the plenum, but here's the outside. It's the top line that I wrapped inside the plenum. The outside was already wrapped.

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This summer I noticed lots of water pooling on the top of my furnace at the plenum. I opened up the plenum and found one of the copper pipes running out to the compressor (the larger one) had...