PadMatch / Every humidifier water panel and furnace filter size
- Nominal size
- 20 x 25 x 6 in
- Actual size
- 19.75 x 24.25 x 6 in
- Depth class
- 6 in (media cabinet)
- Typically installed on
- Aprilaire 2200/2250 and Space-Gard 2200 media cabinets and Honeywell F100/F200 20x25
- Sold in MERV
- sold in MERV 8, 11 and 13 as pleated media
Nominal versus actual dimensions for the 20 x 25 x 6 in furnace and HVAC air filter.
A 20 x 25 x 6 in furnace filter has an actual size of 19.75 x 24.25 x 6 in. The label is the nominal size, rounded up so the filter is easy to name; the panel is cut undersize so it slides into the slot without binding.
A six-inch nominal media filter, actual about 19.75 by 24.25 by 6 inches, that is a genuine six inches thick. It is the Aprilaire 2200 / Space-Gard cabinet size and takes the Aprilaire 201 media.
Order by the nominal size printed on the old filter frame, not by measuring the slot, because every brand runs to the same nominal-to-actual convention.
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.
- 20 x 25 x 6 in actual sizenominal vs actual dimensions
- 16 x 25 x 6 in furnace filteractual 15.75 x 24.25 x 6 in
- Aprilaire 201 media filterAprilaire 201
- MERV 8 vs 11 vs 13 for a furnace filterwhich rating to buy
Sources: Aprilaire 201 replacement media (SupplyHouse) ยท Aprilaire-compatible 2200 air cleaner 20x25x6 media (Filterbuy)