14x20x1 air filter
A 14x20x1 filter is a nominal size. Five brands on this page list it between 13.5 x 19.5 x 0.75 and 13.62 x 19.62 x 0.78 inches, a closer match across brands than many sizes.
- Printed (nominal)
- 14" x 20" x 1"
- Actual, by brand
- 5 filters listed below
- Spread between brands
- 0.12" wide, 0.12" tall, 0.03" deep
- Face area (nominal)
- 1.94 sq ft
Actual size by brand
| Brand | Width | Height | Depth | Source |
|---|---|---|---|---|
| Filterbuy | 13.5" | 19.5" | 0.75" | [1] |
| Nordic Pure | 13.5" | 19.5" | 0.75" | [2] |
| AIRx (Discount Filters) | 13.5" | 19.5" | 0.75" | [3] |
| Aerostar | 13.5" | 19.5" | 0.75" | [5] |
| Filtrete | 13.62" | 19.62" | 0.78" | [4] |
MERV options
| Brand | MERV ratings sold at this size | Source |
|---|---|---|
| Filterbuy | 8, 11, 13 | [1] |
| Nordic Pure | 6, 7, 8, 10, 11, 12, 13, 14, 16 | [2] |
| AIRx (Discount Filters) | 7, 8, 11, 13 | [3] |
| Aerostar | 11 | [5] |
| Filtrete | 12 | [4] |
What MERV means: EPA, "What is a MERV rating?"
Listed prices
Prices change often. These are what each seller listed on the date shown.
| Seller | MERV | Pack | Price | Each | Checked | |
|---|---|---|---|---|---|---|
| Discount Filters | 8 | 4 | $49.95 | $12.49 | Oct 21, 2026 [3] | Check price |
| Nordic Pure | 8 | 6 | $51.99 | $8.67 | Oct 21, 2026 [2] | |
| Amazon (Aerostar) | 11 | 4 | $34.99 | $8.75 | Oct 21, 2026 [5] | Check price |
Printed size vs actual size
The 14x20x1 on the frame is a nominal size. The filter itself is about half an inch smaller on each side. Filterbuy, Nordic Pure, the AIRx line at Discount Filters and Aerostar all list 13.5 x 19.5 x 0.75 inches. Filtrete's Amazon listing gives 13.62 x 19.62 x 0.78.
How much the brands differ
For this size the brands are close. Four of the five list exactly 13.5 x 19.5 x 0.75, and Filtrete is 0.12 inches larger on width and height and 0.03 inches deeper.
How to measure and what to buy
Read the size printed on your current filter, then measure the slot: width, height and depth. If the slot measures 13.5 x 19.5 or a little more, any of these brands should fit. If you have a bit of extra room, the slightly larger Filtrete cut leaves less gap at the edges. If the slot is tight, stick with a 13.5 x 19.5 brand, since a filter that is too big will not go in.
Depth matters
The 1 inch filters on this page are 0.75 to 0.78 inches thick. A 1 inch slot cannot take a 2 or 4 inch filter, even with the same 14x20 face. Filtrete lists its MERV 12 version as MPR 1500.
Questions
What is the actual size of a 14x20x1 filter?
Filterbuy, Nordic Pure, AIRx and Aerostar list 13.5 x 19.5 x 0.75 inches. Filtrete lists 13.62 x 19.62 x 0.78.
How much do 14x20x1 brands differ in size?
Across the five brands on this page, width and height differ by up to 0.12 inches, and depth by up to 0.03 inches.
Will a 14x20x2 filter fit a 14x20x1 slot?
No. The 1 inch filters on this page are 0.75 to 0.78 inches deep, and a 1 inch slot has no room for a filter 2 or more inches deep.
Similar sizes
Not sure which you have? How to read and measure your filter.
Sources
- Filterbuy 14x20x1 air filter product page, read Oct 21, 2026
- Nordic Pure 14x20x1 air filter product page (actual size and price shown per MERV and box size), read Oct 21, 2026
- Discount Filters 14x20x1 furnace air filters, read Oct 21, 2026
- Filtrete 14x20x1 Air Filter, MERV 12, MPR 1500, 2 HVAC Filters (Amazon), read Oct 21, 2026
- Aerostar 14x20x1 Air Filter MERV 11, 4 Pack (Amazon), read Oct 21, 2026