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· Retired Moderator
16,386 Posts
If you use the spray foam and the plastic wrap I would oil the tools really well first. Years ago I used some spray foam to seal the duct and wiring area of a range hood. A couple of years ago I replaced the fan with a new one and found that the spray foam had dissolved the outer plastic sheath on the loomex/romex wire. The inner conductors were okay but there was nothing left of the outer sheath.
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