Step 1

Measure your Length and Width (L x W)

Step 2

Measure the Depth (D) of your Filter

Step 3

Couple Measurements together (L x W x D)

Actual Size versus Nominal Size

Actual Size Example: 19 1/2 x 19 1/2 x 3/4

Nominal Size Example: 20x20x1

WATCH OUR VIDEO - HOW TO MEASURE

 

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