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Build your own custom AC or furnace filter in a few easy steps
Nominal Size
Actual Size
Merv Rating

Bulk Quantity Pricing

4 6 12 48 72 120
Quantity

21.25x21.25x1

21.25x21.25x1

MERV 11

$17.33 $15.60 $15.25 $14.73 $13.00 $12.13
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21.25x21.25x2

21.25x21.25x2

MERV 11

$17.00 $15.30 $14.96 $14.45 $12.75 $11.90
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21.25x21.25x4

21.25x21.25x4

MERV 11

$36.78 $33.10 $32.37 $31.26 $27.59 $25.75
Add to Cart