PadMatch / Every humidifier water panel and furnace filter size
- Part number
- AprilAire 45
- Brand
- AprilAire
- Published dimensions
- 9.875 in W x 12.875 in H x 1.75 in D (nominal 10 x 13 x 2)
- Construction
- aluminum-reinforced paper wick with an anti-microbial coating
- Fits humidifier models
- AprilAire 400, 400A, 400M
Dimensions, fit list and cross-references for the AprilAire 45 humidifier pad.
- AprilAire 400
- 400A
- 400M
The AprilAire 45 fits AprilAire 400, 400A, 400M.
The 400-series is an evaporative bypass humidifier with no fan and no water waste, so its wick is a different, paper-based part from the 35 and installs in either orientation with no paint dot.
Manufacturers recommend replacing the pad once per heating season; a hardened, scaled or crumbling pad cuts humidity output long before it looks worn out.
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.
- What pad fits the AprilAire 400 whole-house humidifierAprilAire 400 / 400M
- AprilAire 45 equivalent and cross-referencescompatible and generic pads
- AprilAire Water Panel 35same brand, different size (AprilAire 35)
- AprilAire Water Panel 10same brand, different size (AprilAire 10)
- AprilAire Water Panel 12same brand, different size (AprilAire 12)
Sources: AprilAire Water Panel 45 product page ยท AprilAire Water Panel Guide