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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 FC40R1185 - (18 x 18 )

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, 18X18X4 (17 3/4 x 17 3/4 x 3 3/4) MERV 13
ONLY: $42.86 each - Click "BEAT THE PRICE DEAL" On Top Menu to see the deal details
Honeywell Air Filter SEAL-TIGHT™ Return Air Grille Filter, 18X18X4 (17 3/4 x 17 3/4 x 3 3/4) MERV 11
ONLY: $40.86 each - Click "BEAT THE PRICE DEAL" On Top Menu to see the deal details
Honeywell Air Filter SEAL-TIGHT™ Return Air Grille Filter, 18X18X4 (17 3/4 x 17 3/4 x 3 3/4) MERV 8
ONLY: $38.86 each - Click "BEAT THE PRICE DEAL" On Top Menu to see the deal details
Return Grille Air Filter SEAL-TIGHT™ Return Air Grille Filter with ODOR DEFENSE® 18X18X4 (17 3/4 x 17 3/4 x 3 3/4)
ONLY: $49.53 each - Click "BEAT THE PRICE DEAL" On Top Menu to see the deal details