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i wanted to put a cover on opening of 33" x 23" on my unused fireplace as it has draft. I noticed the flue even is close has a gap so that might where the draft came from.
I am thinking to use this but i am unusre if its environmentally friendly?
Should i just use a plywood and paint with anti-mold+mildew interior paint or use a pressure treated plywood?
I will not use this fireplace anymore.