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18x18x4 Air Filter

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    Pleated | MERV Rating 8
    18 x 18 x 4 Basic MERV 8 Pleated Air Filter
    Get your First Filter Free with Auto Delivery
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    • Actual Size: 17 7/8" x 17 7/8" x 3 3/4"
    • Product #: P80S.041818
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    Pleated | MERV Rating 11
    18 x 18 x 4 MERV 11 Pleated Air Filter
    Get your First Filter Free with Auto Delivery
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    • Actual Size: 17 7/8" x 17 7/8" x 3 3/4"
    • Product #: P15S.041818
  • Home Ultimate

    Pleated | MERV Rating 13
    18 x 18 x 4 MERV 13 Pleated Air Filter
    Get your First Filter Free with Auto Delivery
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    • Actual Size: 17 7/8" x 17 7/8" x 3 3/4"
    • Product #: P25S.041818
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