How To Measure For Your Filter

How To Measure For Your Filter

Most of the time you can purchase the same size filter you currently have in your HVAC system.

However, if you have:

A new system without a filter

Difficult filter size to find

A filter that doesn’t fit like you think it should

A filter that you have pieced together and created yourself so that it fits properly

You need to follow the instructions below to determine the proper size filter for your system.

MEASURE FOR A CEILING OR WALL FILTER BEHIND A LOUVERED COVER

(generally for A/C system air intake)

Measure the length (This example is 22 inches)

Measure the width (This example is 14 inches)

Then measure the depth of the filter housing, from the lip to surface edge.
This example is 1¼” which provides enough clearance for the filter to fit and the enclosure door to close and lock shut.

In this scenario (Ceiling return filter) you can you use an exact fit filter that is 22”x14”x1” or you could use a 21¾”x13¾”x1”

MEASURE FOR A FURNACE FILTER

(usually in a basement, garage or utility room/closet)

Find this spot on your furnace. Yours may look slightly different but most all are usually labeled in some way to indicate where the filter is located.

Measure the length from back to front. (This example is 19.25 inches)

Measure the width of the opening where the filter would slide in. (This example is 19.25 inches)
Then measure the height of this same opening and that will give you the thickness measurement.
This particular example is a standard 1.25 inches in height.
​The proper fit filter for this scenario is 19”x19”x1”