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  1. Showing 1 - 36 out of 177 results for "13 x 21.5 furnace filter"
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      Filterbuy 13X21.5X1 Air Filter MERV 13, Pleated HVAC AC Furnace Filters Replacement 13.0 H X 21.5 W X 1.0 D | 13" H X 21.5" W X 1" D | Wayfair
      Filterbuy 13X21.5X1 Air Filter MER…
      $111.35
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      Filterbuy 13 X 21.5 X 1 Air Filter MERV 8, Pleated HVAC AC Furnace Filters Replacement 13.0 H X 21.5 W X 1.0 D In Silver | Wayfair
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      Filterbuy 13X21.5X1 Pleated Air Filters, Replacement HVAC AC Furnace (MERV 11)
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      Filterbuy 13X21.5X1 Pleated Air Filt…
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      Filterbuy 13X21.5X1 Pleated Air Filters, Replacement HVAC AC Furnace (MERV 8)
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      Filterbuy 13X21.5X1 Pleated Air Filt…
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      Filterbuy 13X21.5X1 Air Filter MERV 13 Optimal Defense (1-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size 12.88 X 21.50 X 0.75 in
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      MERV8 13 X 21-1/2 X 1 WASHABLE Pleated HVAC Air Furnace Custom EG8 Filter
      MERV8 13 X 21-1/2 X 1 WASHABL…
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      MERV8 13 X 21-1/2 X 1 WASHABL…
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      13 X 21.5 X 1 Permanent Washabl…
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      Filterbuy 13X21 . 5X1 Air Filter MER…
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      21X23.5X1 Air Filter MERV 13 Opti…
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      13"X 21 1/2"X 1" AC Furnace Air Filt…
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      Filterbuy 13X21.5X2 Merv 13 Pleate…
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      2Pk 21X21x4.5 MERV 13 Furnace …
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      2Pk 21X21x4.5 MERV 13 RXFH-E2…
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      13X21.5X1 (Actual Size) MERV 8 F…
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      Filter King 13X21.5X0.5 Air Filter 4-…
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      2Pk 21X21x4.5 MERV 13 RXHF-E2…
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      Aerostar 13 X 21 1/2 X 1 Merv 13 Pl…
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      Aerostar 21 1/2X23 3/8X1 MERV 1…
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      Aerostar 13X21 1/2X1 MERV 13 Ple…
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      Aerostar 13X21 1/2X1 MERV 13 Fu…
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      Filter King 13.5X21.5X1 Air Filter | …
      ($15.63 / 1 ct)
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      13.2 In.21.5 In.1 in. MERV 13 Premi…
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      13.2 In.21.5 In.1 in. MERV 13 Premi…
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      13X21.5X1 11 Pleated HVAC AC F…
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      21 1/2X23x1 Exact MERV 13 Plus …
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      21 1/2X23x1 Exact MERV 13 AC Fu…
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      19.88X21.5X1 Air Filter (2-Pack), Pl…
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      Aerostar 21 1/2X21 1/2X1 MERV 13…
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      Aerostar 13X21 1/2X1 MERV 8, Ple…
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      Aerostar 21 1/2X23 3/8X1 MERV 1…
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      Aerostar 13X21 1/2X1 MERV 11, Pl…
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      Aerostar 13X21 1/2X1 MERV 11 Ple…
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      13X21_3/4X1 Exact MERV 13 AC F…
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      21 1/2 X 23 1/2 X 1 AC And Furnac…
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