Filterless Filter Frame. I figured if they didn’t want to see screws, then the closure knob would also be a stand out, so I opted for a magnet enclosure. We could even make a key to open it (Basically a T shape to put inside the pattern, turn and pull open. Super simple.
The design cannot go the full 7” span, so the minimum for the flange is ¼”. You’ll see that in the drawing. We can bend ¾” walls on all four sides to create the distance from the ceiling requested, with a solid backer.
