PadMatch / Every humidifier water panel and furnace filter size
- Nominal size
- 16 x 25 x 6 in
- Actual size
- 15.75 x 24.25 x 6 in
- Depth class
- 6 in (media cabinet)
- Typically installed on
- Aprilaire 2400 and Space-Gard 2400 media cabinets and Honeywell F100/F200 16x25
- Sold in MERV
- sold in MERV 8, 11 and 13 as pleated media
Nominal versus actual dimensions for the 16 x 25 x 6 in furnace and HVAC air filter.
A 16 x 25 x 6 in furnace filter has an actual size of 15.75 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.
The 16-wide six-inch media filter, a genuine six inches deep. It is the Aprilaire 2400 / Space-Gard 2400 cabinet size and takes the Aprilaire 401 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.
- 16 x 25 x 6 in actual sizenominal vs actual dimensions
- 20 x 25 x 6 in furnace filteractual 19.75 x 24.25 x 6 in
- Aprilaire 401 media filterAprilaire 401
- MERV 8 vs 11 vs 13 for a furnace filterwhich rating to buy
Sources: Aprilaire 401 MERV 13 replacement media for 2400 / Space-Gard 2400 (Amazon OEM) ยท Atomic Filters nominal vs actual air filter size chart