21-1/2 x 21-1/2 x 4 Air Filter

  • MERV 8

    Pleated
      Fights lint, dust mites, mold spores, pollen, pet dander, and dust.
      21 1/2 x 21 1/2 x 4 MERV 8 Pleated Air Filter product photo
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    • MERV 11

      Pleated
        Fights lint, dust mites, mold spores, pollen, pet dander, dust, and smoke.
        21 1/2 x 21 1/2 x 4 MERV 11 Pleated Air Filter product photo
        View Terms and Conditions
      • MERV 13

        Pleated
          Fights lint, dust mites, mold spores, pollen, pet dander, fine dust, smoke, viruses, and bacteria.
          21 1/2 x 21 1/2 x 4 MERV 13 Pleated Air Filter product photo
          View Terms and Conditions
        • Choose Your Filter

          Select Quality

          Select Quantity

          Buy more and save!
          • 102.96 6-Pack (17.16 each)
          • 185.40 12-Pack (15.45 each)

          Select Quantity

          Buy more and save!
          • 114.42 6-Pack (19.07 each)
          • 205.92 12-Pack (17.16 each)

          Select Quantity

          Buy more and save!
          • 129.66 6-Pack (21.61 each)
          • 233.40 12-Pack (19.45 each)

          About 21-1/2 x 21-1/2 x 4 Air Filter

          Please Note: Due to COVID-19, MERV 11 media supplies are limited at this time. Please check back here soon for updates or consider our MERV 13 filters.
          • Actual Size: 21 1/2" x 21 1/2" x 3 3/4"
          • Product: P25S.0421H21H