Furnace Filters
Can I do with my furnace filter and install a grid of return air filter in place?
I'd rather have a return air filter grille instead of using a furnace filter because of the limited space my central air / furnace is located in too, by pure curiosity. Are there implications in using two filters?
Francis G is right, with another note. The assumption is that you only single return grille air. If you have multiple return air, you would need a filter in each. Therefore you will usually find the filter in the unit because it will filter the return air, including any outside air that could be made through the duct system (not common in the residential sector, however).
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