Filter Fit FinderAprilAire · humidifier · whole house bypass
AprilAire 440 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)
Opens an Amazon search for AprilAire Water Panel 12. Check the listing says 12.
Compatible alternatives (third party claims)
These fits are claimed by the seller, not by AprilAire. We list them for completeness and label them.
- GeneralAire GA12 Third party claim
GeneralAire says its GA12 Vapor Pad fits AprilAire models 112, 224, 440, 445 and 445A
Seller's page
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 7 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
- 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'
- 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: 'For Models 220, 224, 440, 445, 448, 558, 560, and 568 close the bypass damper in the bypass pipe'
- shop.aprilaire.com Maker's own page checked Oct 1, 2026
AprilAire 12 Replacement Water Panel
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'