I did something similar, but since this is also the return air vent for the furnace, I added a HEPA AC Filter. Just got one the width and double the height and cut it in half and change them about every couple of months. Was concerned about restricting air flow at first but doesn't seem to bother the furnace. I think this was an OZZ mod that he suggested. Gotta luv the OZZ man.....
Jack I didn't mean to steal the thread. You also have a great idea to keep insects out. So far we have not been plagued with them yet.
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