Filter Fit FinderAprilAire · humidifier
AprilAire 225 replacement filter
Use part 12. Usually once a year (manufacturer owner's manual).
The filter that fits
Maker lists this modelAprilAire Water Panel 12
AprilAire 12 Replacement Water Panel
- Part number
- 12
- How many
- 1 per unitpacks: 12 02 (2), 12 04 (4), 12 10 (10)
- How often
- Usually once a year (manufacturer owner's manual)
- Size
- 15 x 12 x 2 in15 x 12 x 2 in nominal (14.75 x 11.5 x 1.75 actual)
The maker does not say how many pads the unit holds; one is assumed.
Opens an Amazon search for AprilAire Water Panel 12. Check the listing says 12.
Does your exact model share this filter?
AprilAire labels several versions of the 225. Check the label on your unit.
- 225 takes 12
- Chippewa 225 same filter · AprilAire's panel 12 page lists '225' in its heading and 'Chippewa 225' in its compatible models
Sources
High confidence: the manufacturer names this exact model on a live page. Each line is the page we read and the day we read it.
- Which filter fits shop.aprilaire.com Maker's own page checked Oct 1, 2026
AprilAire 12 Replacement Water Panel For 112, 136, 224, 225, 440, 445, 445A, and 448 Whole-House Humidifiers ... Compatible Models: 112, 136, 224, 440, 445, 445A, 448, Chippewa 224, Chippewa 225
- How often appliancefactoryparts.com Maker's own page checked Oct 1, 2026
AprilAire owner's manual B2203620A for Models 110, 112, 220, 224, 350, 360, 440, 445, 448, 558, 560, 568, 760 & 768, dealer-hosted copy (Appliance Factory Parts), PDF p11: 'we recommend that you replace the water panel evaporator in your Aprilaire Humidifier annually' ... 'the Water Panel evaporator is usually changed once a year'
- Size shop.aprilaire.com Maker's own page checked Oct 1, 2026
Materials: Aluminum, Synthetic Fiber Nominal Measurements: 15H x 12W x 2D (inches) Actual Measurements: 14.75H x 11.5W x 1.75D (inches)
- Packs shop.aprilaire.com Maker's own page checked Oct 1, 2026
Package Size 1-pack, 2-pack, 4-pack, 10-pack; SKUs '12', '12 02', '12 04', '12 10'
Show all 6 sources
Which filter fits
- shop.aprilaire.com Maker's own page checked Oct 1, 2026
AprilAire 12 Replacement Water Panel For 112, 136, 224, 225, 440, 445, 445A, and 448 Whole-House Humidifiers ... Compatible Models: 112, 136, 224, 440, 445, 445A, 448, Chippewa 224, Chippewa 225
- shop.aprilaire.com Maker's own page checked Oct 1, 2026
AprilAire 12 Replacement Water Panel
- appliancefactoryparts.com Maker's own page checked Oct 1, 2026
AprilAire owner's manual B2203620A for Models 110, 112, 220, 224, 350, 360, 440, 445, 448, 558, 560, 568, 760 & 768, dealer-hosted copy (Appliance Factory Parts), PDF p16 (Model 440): 'Inspect Water Panel evaporator (Stock No. 12) and replace if necessary with colored spot up'
How often
- appliancefactoryparts.com Maker's own page checked Oct 1, 2026
AprilAire owner's manual B2203620A for Models 110, 112, 220, 224, 350, 360, 440, 445, 448, 558, 560, 568, 760 & 768, dealer-hosted copy (Appliance Factory Parts), PDF p11: 'we recommend that you replace the water panel evaporator in your Aprilaire Humidifier annually' ... 'the Water Panel evaporator is usually changed once a year'
Size
- shop.aprilaire.com Maker's own page checked Oct 1, 2026
Materials: Aluminum, Synthetic Fiber Nominal Measurements: 15H x 12W x 2D (inches) Actual Measurements: 14.75H x 11.5W x 1.75D (inches)
Packs
- shop.aprilaire.com Maker's own page checked Oct 1, 2026
Package Size 1-pack, 2-pack, 4-pack, 10-pack; SKUs '12', '12 02', '12 04', '12 10'