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I have 14” tubes so I cut ~15” diameter circles from the filters. I take the plastic domes off the top of the tubes and place the filter circles over the top of the tubes and then place the domes back on (at the time of year I use the filters I don’t use the semicircle reflectors, I only use those in winter). Since the filters are a larger diameter than the tubes, the edges get pinched down between the plastic dome and the exterior lip of the tubes and are held in place. I currently don’t have any pictures of this. I’ll get some pictures of them this weekend if you’d like, as I don’t have time to go on the roof and pull the domes off in the morning before work, and it’s getting dark when I get home in the evening and I don’t want to be on the roof at that time.
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