Measuring for your new air filter

Getting a properly sized air filter is one of the most important things a person can do to protect their home and health. Properly filtered systems last years longer; they also run much more efficiently, resulting in energy savings. But most importantly, recent studies have linked polluted indoor air to heart disease, stroke, and cancer.

 

path of least resistance

If air has a choice between resistance and no resistance, it will take the path of least resistance every time. If your air filter is not correctly sized and sealed, all the air and pollution will go around it and avoid filtration altogether. To make matters worse, some people purchase high-efficiency air filters to get better filtration. But higher efficiency usually means greater resistance, which only compounds the problem.


How do I know what size air filter I need?

Check to see if your furnace or A/C has an existing air filter in it. If so, does it fit properly? If it contains a disposable furnace filter, are there any crushed corners or has the filter been forced into the system to fit? If not, measure the existing filter with a tape measure. That is the replacement size you should be ordering for your new AIRTEVA air filter. If the filter does not fit properly, or you do not have an existing air filter in your system, you will have to measure the grill opening or the filter slot of your furnace/air handler. If you have any questions or concerns - we're here to help! Click Here to ask your question, we'll respond within 24 hours.


WHERE ARE AIR FILTERS LOCATED?

You can find your air filter inside your heating/cooling system or the return grills in your home. These return grills might be on the ceiling or a wall.

replace AC filters

How do I measure air filters in grills or vents?

1. Many air filter grills have obstructions such as stop tabs, rivets, and screws. You want to make sure you take your measurement between these objects and subtract 3/8 inch, so the air filter will fit between them when you install it.

2. Because AIRTEVA air filters feature a Patented Leak-Guard seal, the filter does not have to fit edge to edge tight. As long as your measurement is larger than the inner lip of the grill, your filter will seal properly. Leave yourself room to remove and re-install it easily.

3. Always open the air filter grill to take the measurement; don't assume the inside size is the same as the outside.



4. Do not take your measurement from the size printed on your throw-away type furnace filters. Many times the size printed on those filters is a nominal size and not the size of the actual filter. It is common for a filter to be undercut up to 1/2" from the nominal size


Printed size VS Actual size

Printed Filter Size
Actual Size
14x14x1
13 3/4 x 13 3/4 x 3/4
14x20x1
13 1/2 x 19 1/2 x 3/4
14x24x1
13 3/4 x 23 3/4 x 3/4
14x25x1
13 1/2 x 24 1/2 x 3/4
14x30x1
13 7/8 x 29 7/8 x 3/4
15x20x1
14 1/2 x 19 1/2 x 3/4
16x16x1
15 1/2 x 15 1/2 x 3/4
16x20x1
15 1/2 x 19 1/2 x 3/4
16x24x1
15 3/8 x 23 3/8 x 3/4
16x25x1
15 1/2 x 24 1/2 x 3/4
16x30x1
15 3/4 x 29 3/4 x 3/4
18x18x1
17 1/2 x 17 1/2 x 3/4
18x20x1
17 1/2 x 19 1/2 x 3/4
18x24x1
17 3/8 x 23 3/8 x 3/4
18x25x1
17 1/2 x 24 1/2 x 3/4
18x30x1
17 3/4 x 29 3/4 x 3/4
19.5x23.5x.75
19-3/8 x 23-3/8 x 3/4
20x20x1
19 1/2 x 19 1/2 x 3/4
20x24x1
19 1/2 x 23 1/2 x 3/4
20x25x1
19 1/2 x 24 1/2 x 3/4
20x30x1
19 5/8 x 29 5/8 x 3/4
24x24x1
23 3/8 x 23 3/8 x 3/4
24x30x1
23 1/2 x 29 1/2 x 3/4
25x25x1
24 1/2 x 24 1/2 x 3/4


How do I measure air filters in furnaces and air handlers?

1. When measuring the filter track or slot, look for any obstructions, such as screws. Be sure to allow for any obstruction in your measurements.

2. Because AIRTEVA air filters feature a Patented Leak-Guard seal, the filter does not have to fit edge to edge tight. As long as your measurement is larger than the inner lip of the track, your filter will seal properly. Leave yourself room to remove and re-install it easily.

3. AIRTEVA air filter frame is made of sturdy aluminum and will not bend.




air handler air filter

measure ac filters
Measure length of filter, front to back.
air filter thickness


Take your time. Get it right, and you'll never have to do it again; these air filter frames can last a lifetime!


If you have any questions, or concerns - we're here to help! Click Here to ask your question, we'll respond within 24 hours.

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