• Filter King 21×53.5×1 Air Filter 4-PACK MERV 8 Actual Size 21 x 53.5 x .75″ – FK21x53.5x1A-M8 -4 WholesaleHVACDirect
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Filter King

Filter King 21×53.5×1 Air Filter 4-PACK MERV 8 Actual Size 21 x 53.5 x .75″ – FK21x53.5x1A-M8 -4

Filter King 21×53.5×1 Air Filter 4-PACK MERV 8 Actual Size 21 x 53.5 x .75″ – FK21x53.5x1A-M8 -4

$132.85 USD
$132.85 USD
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FK21x53.5x1A-M8

  • FK – Likely stands for Filter, Knife-edge style or a specific series/model prefix from a manufacturer.

  • 21x53.5x1 – The nominal filter size:

    • 21 in (height)

    • 53.5 in (width)

    • 1 in (thickness)

  • A-M8 – Usually a manufacturer’s series/code for the media type, frame style, or MERV rating variant.

“-4” at the end typically means:

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