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Richard, I use the foam pink house insulation in all my vents in the winter time. Its pink in color and got it at Home Depot. comes in a 4x8 sheet for just a few dollars. its easy to cut to size with a sharp knife or razor blade. cut it where it fits tight and I use masking tape around the edge. even looks good! lol. but it keeps out light and keeps the warmth in. And oh yea I cut it to fit up inside the frame.
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