Return air grille filters sit in the grille itself rather than in a central filter rack—common in older homes, historic properties, and systems where the return air handler doesn't have a dedicated filter slot.

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  • 29-1/8x19-3/8x1 Exact Pleated MERV 8 Filters (12 pack)
    AAF Flanders

    30x20x1 Grille Cut Pleated MERV 8 Filter 29 1/8 x 19 3/8 x 1 E

    $247.99
    $247.99
    Case of 12 $20.67/filter
  • 19-1/8x7-3/8x1 Exact Pleated MERV 8 Filters (12 pack)
    MERV 8
    AAF Flanders

    12x8x1 Grille Cut Pleated MERV 8 Filter 19 1/8 x 7 3/8 x 1 E

    $193.99
    $193.99
    Case of 12 $16.17/filter

Return Air Grille Filters

Return air grille filters sit in the grille itself rather than in a central filter rack—common in older homes, historic properties, and systems where the return air handler doesn't have a dedicated filter slot. These are typically larger (often 20x30 or 25x30) and thinner (1/2″ or 1″) than central HVAC filters.

Where They're Used

  • Older homes built before centralized filter racks were standard
  • Multiple return grilles — each grille gets its own filter
  • High ceilings & commercial — where maintenance access favors the grille location

Common Grille Sizes

20x20, 20x25, 20x30, 25x25, and 25x30 are the most common—with 1/2″ and 1″ depths. Non-standard grille openings are a great use case for our custom cut service.

MERV Considerations

Grille filters are typically available in MERV 4 through MERV 11. Higher MERV ratings can restrict airflow more significantly when applied to multiple return grilles in parallel, so verify with your HVAC tech if you're considering MERV 13 across multiple grille locations.