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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 FC40R1144 - ( 21 x 26 )

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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SEAL-TIGHT™ Return Air Grille Filter, 21X26X4 (20 3/4 x 25 3/4 x 3 3/4) MERV 8

Honeywell Filter Replacement Filter- Grille Aftermarket Air Filter, Furnaces:

Nominal size 21" x 26" x 4" Actual size 20 3/4" x 25 3/4" x 3 3/4"

ONLY: $39.86 each - DUE TO CANADA FIRES AND A LABOR SHOTAGE LEAD TIME IS 3-4 WEEKS

SEAL-TIGHT™ Return Air Grille Filter, 21X26X4 (20 3/4 x 25 3/4 x 3 3/4) MERV 11

Honeywell Filter Replacement Filter- Grille Aftermarket Air Filter, Furnaces:

Nominal size 21" x 26" x 4" Actual size 20 3/4" x 25 3/4" x 3 3/4"

ONLY: $43.86 each - DUE TO CANADA FIRES AND A LABOR SHOTAGE LEAD TIME IS 3-4 WEEKS

SEAL-TIGHT™ Return Air Grille Filter, 21X26X4 (20 3/4 x 25 3/4 x 3 3/4) MERV 13

Honeywell Filter Replacement Filter- Grille Aftermarket Air Filter, Furnaces:

Nominal size 21" x 26" x 4" Actual size 20 3/4" x 25 3/4" x 3 3/4"

ONLY: $46.86 each - DUE TO CANADA FIRES AND A LABOR SHOTAGE LEAD TIME IS 3-4 WEEKS

SEAL-TIGHT™ Return Air Grille Filter, 21X26X4 (20 3/4" X 25 3/4" X 3 3/4") With ODOR DEFENSE®

Genuine OXYCLEAN AIR FILTERS with ODOR DEFENSE®

Honeywell Filter - Grille Aftermarket Air Filter, Furnaces For:

Nominal size 21" x 26" x 4" Actual size 20 3/4" x 25 3/4" x 3 3/4"

ONLY: $49.53 each - DUE TO CANADA FIRES AND A LABOR SHOTAGE LEAD TIME IS 3-4 WEEKS