21x21x1

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• 

  21x21x1 Reusable MERV 6 Electrostatic Air Filter

  $55.32
  L: 20.5in, W: 20.5in, H: 0.875in
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• 

  21x21x1 Nominal Air Filter Pad Holding Frame

  $45.34
  L: 20.5in, W: 20.5in, H: 0.875in
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