18x20x1

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• 

  18x20x1 Reusable MERV 6 Electrostatic Air Filter

  $50.36
  L: 17.5in, W: 19.5in, H: 0.875in
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• 

  18x20x1 Nominal Air Filter Pad Holding Frame

  $24.94
  L: 17.5in, W: 19.5in, H: 0.875in
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• 

  18x20x1 Nominal Air Filter Pad Holding Frame, With Retainer Gate

  $28.94
  L: 17.5in, W: 19.5in, H: 0.875in
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