There is indeed a hinge on one side and a catch or two on the other. Mine are the same as what are on my cabinets. You should run your fingers around the three sides to release the ceiling material which is probably stuck to the cover. Now grab the cover on the side opposite the hinge. Put your fingers on the top edge of that side in the middle. This is where the catch is. Just pull straight down with firm pressure. Your cover should swing down exposing your filter. Be sure to look up and inside. If it is dirty at all or any dust on the fins, get a vacuum and clean them too. I can send you a pic of mine open if you want.
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