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Actual sizes vary depending on brand. 5" depth is really
4 3/8, or 4 3/4, or 5 1/4 .
> Honeywell Air Filters > Honeywell FC40R Series, Return Grill Media Filters > Honeywell FC40R1830 - ( 18 x 30 x4)

HONEYWELL AIR FILTER

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SEAL-TIGHT™ GRILL FILTER

Seal-Tight filters have a one inch foam strip along the perimeter.
Unlike other return grill filters, the special foam strip creates
a very tight fit that prevents any air from by-passing the filter.

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Honeywell Air Filter SEAL-TIGHT™ Return Air Grille Filter, 18X30X4 (17 3/4X29 3/4X3 3/4) MERV 8
ONLY: $39.86 each - WE BEAT ANY PRICE - Just email info@oxyclean.com
Honeywell Air Filter SEAL-TIGHT™ Return Air Grille Filter, 18X30X4 (17 3/4X29 3/4X3 3/4) MERV 11
ONLY: $41.86 each - WE BEAT ANY PRICE - Just email info@oxyclean.com
Honeywell Air Filter SEAL-TIGHT™ Return Air Grille Filter, 18X30X4 (17 3/4X29 3/4X3 3/4) MERV 13
ONLY: $43.86 each - WE BEAT ANY PRICE - Just email info@oxyclean.com
Return Grill Air Filter SEAL-TIGHT™ Return Air Grille Filter, 18X30X4 (17 3/4 x 29 3/4 x 3 3/4) ODOR DEFENSE®
ONLY: $49.53 each - WE BEAT ANY PRICE - Just email info@oxyclean.com