Air Conditioner Filter and Furnace Filter Size Chart

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Choose Your Air Filter Size:

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To determine the size of air filter you need, simply remove the old filter and look at the sides of the filter. A label should be affixed that indicates the nominal (or approximate) size of the filter. A 16 x 25 x 1 air conditioner filter is fairly common, but be aware that this is the nominal (approximate) size. The actual dimensions of the filter will be somewhat smaller, perhaps as much as ½" an inch smaller in both directions. Once you have found the label or printing with the size on it, be sure to replace the old filter until you have a clean one to replace it.

If you cannot find a size sticker on the filter, measure it. Compare the measurements you just made against our air filter size chart below to pick your filter size.

If there is no filter to measure, find the track that the air filter would normally fit into. Measure the inside of the track and compare that measurement to our filter size chart to pick the air filter size that will fit your central air conditioner / furnace. Choose the actual size that is up to ½" smaller than the length and width you measured so that the air filter fits in the track.

Frame thickness is 7/8"

Nominal Size	Actual Size	Nominal Size	Actual Size	Nominal Size	Actual Size
8 x 16 x 1	8-7/8 x 15-7/8	14 x 14 x 1	13-7/8 x 13-7/8	18 x 18 x 1	17-7/8 x 17-7/8
		14 x 20 x 1	13-7/8 x 19-7/8	18 x 20 x 1	17-7/8 x 19-7/8
10 x 10 x 1	9-7/8 x 9-7/8	14 x 24 x 1	13-7/8 x 23-7/8	18 x 24 x 1	17-7/8 x 23-7/8
10 x 20 x 1	9-7/8 x 19-7/8	14 x 25 x 1	13-7/8 x 24-7/8	18 x 25 x 1	17-7/8 x 24-7/8
10 x 24 x 1	9-7/8 x 23-7/8	14 x 30 x 1	13-7/8 x 29-7/8
10 x 25 x 1	9-7/8 x 24-7/8			20 x 20 x 1	19-5/8 x 19-5/8
		15 x 20 x 1	14-7/8 x 19-7/8	20 x 24 x 1	19-7/8 x 23-7/8
12 x 12 x 1	11-7/8 x 11-7/8	15 x 25 x 1	14-7/8 x 24-7/8	20 x 25 x 1	19-5/8 x 24-5/8
12 x 20 x 1	11-7/8 x 19-7/8			20 x 30 x 1	19-7/8 x 29-7/8
12 x 24 x 1	11-7/8 x 23-7/8	16 x 16 x 1	15-7/8 x 15-7/8
12 x 25 x 1	11-7/8 x 24-7/8	16 x 20 x 1	15-3/4 x 19-1/2	24 x 24 x 1	23-7/8 x 23-7/8
12 x 30 x 1	11-7/8 x 29-7/8	16 x 24 x 1	15-7/8 x 23-7/8	24 x 30 x 1	23-7/8 x 29-7/8
		16 x 25 x 1	15-3/4 x 24-5/8
				25 x 25 x 1	24-7/8 x 24-7/8

Choose Your Air Filter

Frame thickness is 3/4"

Nominal Size	Actual Size	Nominal Size	Actual Size	Nominal Size	Actual Size
10 x 20 x 1	9-1/2 x 19-1/2	16 x 16 x 1	15-1/2 x 15 1/2	20 x 20 x 1	19-1/2 x 19-1/2
		16 x 20 x 1	15-1/2 x 19 1/2	20 x 24 x 1	19-1/2 x 23-1/2
12 x 18 x 1	11-1/2 x 17-1/2	16 x 24 x 1	15-1/2 x 23 1/2	20 x 25 x 1	19-1/2 x 24-1/2
12 x 20 x 1	11-1/2 x 19-1/2	16 x 25 x 1	15-1/2 x 24 1/2	20 x 30 x 1	19-1/2 x 29-1/2
12 x 24 x 1	11-1/2 x 23-1/2
		18 x 18 x 1	17-1/2 x 17 1/2	24 x 24 x 1	23-1/2 x 23-1/2
14 x 20 x 1	13-1/2 x 19-1/2	18 x 20 x 1	17-1/2 x 19 1/2	24 x 30 x 1	23-1/2 x 29-1/2
14 x 24 x 1	13-1/2 x 23-1/2	18 x 24 x 1	17-1/2 x 23 1/2
14 x 25 x 1	13-1/2 x 24-1/2	18 x 25 x 1	17-1/2 x 24-1/2	25 x 25 x 1	24-1/2 x 24-1/2
15 x 20 x 1	14-1/2 x 19-1/2

Choose Your Air Filter