Shop Vac Filter Flange

I needed a way to mount a fresh air filter on the side of my resin printer cabinet. The 6 inch duct adapter from moogalyn fit the id of the shop vac filter perfectly with a good seal. I added the cross bar section in the middle with a hole for an 8-32 threaded rod to go through the cap on the filter for extra security. Shop-vac filter part number 9030411