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Measure the length needed to be wrapped, add 1/2" to 1" extra, and cut with ordinary scissors. The wrap I used was 16" and it worked well to wrap the circumference of the duct with a little over-lap. Put the over-lap seam down so if water should get in, it will drain out. I had 11" and 8" zip-ties so I used them together to hold the wrap. Snug it down until it just dimples the insulation; don't reef down on it and over-tighten it!
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