A/C filters falling down, falling down, falling down...

And who says Duct-Tape isn't elegant, lol... I guess it depends on how your filter mounts, mine has a screw, so no issues, others I assume are snap or popin, which eventually break the plastic frame. The Inlaws have a metal slid in one, just like the cooking vent. ...so... what ever works to hold it in, will work.

options: Magnets, Velcro, screws, and finally tape...