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)
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 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”