21 x 21 x 4 Air Filter

  • MERV 8

    Pleated
      Fights lint, dust mites, mold spores, pollen, pet dander, and dust.
    • MERV 11

      Pleated
        Fights lint, dust mites, mold spores, pollen, pet dander, dust, and smoke.
      • MERV 13

        Pleated
          Fights lint, dust mites, mold spores, pollen, pet dander, fine dust, smoke, viruses, and bacteria.
        • Select Quality

          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.
          • $22.35 1-Pack (22.35 each)
          • $36.96 2-Pack (18.48 each)
          • $52.17 3-Pack (17.39 each)
          • $65.24 4-Pack (16.31 each)
          • $77.50 5-Pack (15.50 each)
          • $92.64 6-Pack (15.44 each)
          • $166.92 12-Pack (13.91 each)
          • $30.50 1-Pack (30.50 each)
          • $51.86 2-Pack (25.93 each)
          • $73.20 3-Pack (24.40 each)
          • $91.48 4-Pack (22.87 each)
          • $108.70 5-Pack (21.74 each)
          • $121.98 6-Pack (20.33 each)
          • $219.72 12-Pack (18.31 each)
          • $35.88 1-Pack (35.88 each)
          • $58.34 2-Pack (29.17 each)
          • $82.35 3-Pack (27.45 each)
          • $102.96 4-Pack (25.74 each)
          • $122.35 5-Pack (24.47 each)
          • $144.90 6-Pack (24.15 each)
          • $260.88 12-Pack (21.74 each)
          View Terms and Conditions

          About 21 x 21 x 4 Air Filter

          • Actual Size: 20 7/8" x 20 7/8" x 3 3/4"
          • Product: P25S.042121

          MERV 8 Fights: Dust Mites, Mold Spores, Lint, Household Dust, Pollen

          MERV 11 Fights: Pet Dander, Smoke, Smog, Coughing, Sneezing, Dust Mites, Mold Spores, Lint, Household Dust, & Pollen

          MERV 13 Fights: Bacteria, Virus Carriers, Pet Dander, Smoke, Smog, Coughing, Sneezing, Dust Mites, Mold Spores, Lint, Household Dust, & Pollen

          • $22.35 1-Pack (22.35 each)
          • $36.96 2-Pack (18.48 each)
          • $52.17 3-Pack (17.39 each)
          • $65.24 4-Pack (16.31 each)
          • $77.50 5-Pack (15.50 each)
          • $92.64 6-Pack (15.44 each)
          • $166.92 12-Pack (13.91 each)
          • $30.50 1-Pack (30.50 each)
          • $51.86 2-Pack (25.93 each)
          • $73.20 3-Pack (24.40 each)
          • $91.48 4-Pack (22.87 each)
          • $108.70 5-Pack (21.74 each)
          • $121.98 6-Pack (20.33 each)
          • $219.72 12-Pack (18.31 each)
          • $35.88 1-Pack (35.88 each)
          • $58.34 2-Pack (29.17 each)
          • $82.35 3-Pack (27.45 each)
          • $102.96 4-Pack (25.74 each)
          • $122.35 5-Pack (24.47 each)
          • $144.90 6-Pack (24.15 each)
          • $260.88 12-Pack (21.74 each)
          View Terms and Conditions