> I am going to insulate the upper ,"corrigated" portion of the exhaust vent > .I think I can do this by packing in rock wool(if I could find it) or > fiberglass insulation like found in houses.
Fiberglass ought to be fine. "Rock wool" is probably overkill. Fiberglass (being made out of glass fibers) won't burn-- just be sure there's no backing material like paper or something attached. |
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