I went to Home Depot to get a vent cover for the interior of the dark room (like Jerold's) and found it, but couldn't find a filter that my contractor had talked about: blue, plastic (or fiberglass?) ,washable, and which probably would have to be cut down from a larger sheet. So I bought the only 12x12x1 filter that is not washable, but seems to fiter down to very fine particles (mites and pollen and mold spores). It's a Natural Aire Standard with an 8 rating. It's white and fibrous. I hope it isn't so fine as to block the flow of air or that fibers will blow around.
Can anyone recommend a filter for the louvers to combat dust?
Sara
Sara