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Return air vents in walls and ceilings use grille filters. They have at least a 7″ depth behind the grille to allow for good flow through the filter. 20x25x5 grille filters allow a greater flow of air because their depth allows the air to flow through much more filter medium than thinner filters.
We carry a variety of standard sizes including 20x25x5, but we can custom make whatever you need in our own manufacturing facility in Missouri. Other manufacturers might just make a couple filters for your application, but we make a full line of MERV rated filters, from MERV 8 through MERV 13, so you don’t have to sacrifice your air quality.