Filter Fit FinderAprilAire · humidifier
AprilAire 136 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.
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'