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This doesn't really answer your question directly but what we did was cut some screen fabric to be an inch bigger all around the opening size. Then sewed on the screen and stuck to the ceiling the two parts of velcro. Works great.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.