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I have a HVAC system with two return air grilles, the filter is located under the unit which is in a wall cabinet. I would like to replace the grilles with the types of grills that accept filters, can I do this without worrying about air flow restriction? If I do this, can I remove the main filter under the unit?

Thanks!
 

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What size system is it.
What size are the holes in the walls.

When the air filter is in the grille. The grille usually needs to be bigger.
 
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