Use the hospital type absorbent pads from drug store. Staple window screen on top of your fume board frame, then layer of the bed protector pad (absorbent side toward the screen) and a top of aluminum flashing painted black or corrogated political sign board painted black. Works very well but so does other materials suggested.
Thanks guys for the info. The Sheetmetal part is easy for me as that's how I make a living. I've been stashing back surplus metal painted black so that's covered. I've had up to 4 fume boards and as Jim mentioned about the wind board, once all 4 are on and 5-7 min have passed, one guy will stay busy removing supers as fast as he wants to move.
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