PadMatch / Every humidifier water panel and furnace filter size
- Nominal size
- 16 x 20 x 1 in
- Actual size
- 15.5 x 19.5 x 0.75 in
- Depth class
- 1 in (flat panel)
- Order by
- nominal size (16 x 20 x 1 in)
- Typically installed on
- compact return grilles and smaller air handlers
The true measured dimensions of a 16 x 20 x 1 in filter and how to order it.
The nominal size 16 x 20 x 1 in is the name on the frame; the actual size is 15.5 x 19.5 x 0.75 in. On a flat filter each face runs about half an inch under nominal and a one-inch filter is really three quarters of an inch thick.
A smaller flat size for compact returns. Actual size is 15.5 by 19.5 by 0.75 inches; it is easy to confuse with a 16 by 25 in a dim basement, but it is five inches shorter.
Find your model
Read the number stamped on the humidifier cabinet or printed on the old pad, then match it below. Confirm the frame size before buying a generic.
- 16 x 20 x 1 in furnace filteractual 15.5 x 19.5 x 0.75 in
- MERV 8 vs 11 vs 13which rating to buy
- 16 x 25 x 1 in actual sizeactual 15.5 x 24.5 x 0.75 in
- 20 x 25 x 1 in actual sizeactual 19.5 x 24.5 x 0.75 in
- 20 x 20 x 1 in actual sizeactual 19.5 x 19.5 x 0.75 in
Sources: Atomic Filters nominal vs actual air filter size chart ยท Filterbuy air filter sizes chart