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Old 05-27-2009, 06:40 PM   #1
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Return air grilles w/filters


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?

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Old 05-27-2009, 08:50 PM   #2
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Return air grilles w/filters


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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