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AprilAire · humidifier · whole house bypass

AprilAire 600 replacement filter

Use part 35. Replace at least once a year (manufacturer owner's manual).

The filter that fits

Maker lists this model

AprilAire Water Panel 35

AprilAire 35 Replacement Water Panel

Part number
35
How many
1 per unitpacks: 35 02 (2), 35 04 (4), 35 10 (10)
How often
Replace at least once a year (manufacturer owner's manual)
Size
13 x 10 x 2 in13 x 10 x 2 in nominal (13 x 10 x 1.75 actual)
Buy Water Panel 35 on AmazonManufacturer page

Opens an Amazon search for AprilAire Water Panel 35. Check the listing says 35.

See the sources

Does your exact model share this filter?

AprilAire labels several versions of the 600. Check the label on your unit.

  • 600 takes 35
  • 600A same filter
  • 600M same filter · Manual-control version, same panel
  • 600KZ same filter
  • 600MKZ same filter

Look-alike models that take a different filter

The look-alike 500 takes panel 10 and the 400 takes panel 45.

Other genuine options from AprilAire

Variants and kits the maker sells for this model. Same fit, different media or packaging.

  • AprilAire H635EZ1A EZKit (35 panel pre-assembled with 4330 scale control insert and 4331 distribution tray)
    H635EZ1A · Find on Amazon
  • AprilAire 4839 Maintenance Kit with 35 Water Panel
    4839 · Find on Amazon

Compatible alternatives (third party claims)

These fits are claimed by the seller, not by AprilAire. We list them for completeness and label them.

  • GeneralAire GA35 Third party claim
    GeneralAire says its GA35 Vapor Pad fits AprilAire models 350, 360, 568, 560, 600, 700, 760 and 768
    Seller's page
  • Lennox X2661 Third party claim
    Lennox says its Healthy Climate #35 water panel X2661 also replaces AprilAire 35 in models 350, 360, 560, 560A, 568, 600, 700, 760, 760A and 768
    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 35 Replacement Water Panel Humidifier Filter
  • How many storage.googleapis.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2209190D (09.23), dealer-hosted copy, PDF p10: 'Replace the Water Panel (Water Panel 35 for Models 600 & 600M and Water Panel 10 for Models 500 & 500M) with a new genuine AprilAire Water Panel'
  • How often storage.googleapis.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2209190D (09.23), dealer-hosted copy, PDF p8: 'replace the Water Panel ... at least annually with the exception of Models 400 and 400M which should be changed at least twice per heating season'
  • Model variants shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Fits '300, 350, 360, 560, 560A, 568, 600, 600A, 600M, 700, 700A, 700M, 760, 760A, and 768 Whole-House Humidifiers'
  • Size shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Nominal 13H x 10W x 2D; actual 13H x 10W x 1.75D (inches)
  • What's in it shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Materials 'Aluminum, Synthetic Fiber'; 'heavy-duty aluminum mesh frame' with 'a porous ceramic-type coating'
  • Packs shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Package Size 1-pack, 2-pack, 4-pack, 10-pack; store SKUs '35', '35 02', '35 04', '35 10'
  • Other genuine options shop.aprilaire.com Maker's own page checked Oct 1, 2026
    H635EZ1A: '4330 Scale Control Insert, 4331 Distribution Tray, and 35 Water Panel'; 'For 600, 600A, and 600M'
Show all 17 sources

Which filter fits

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    AprilAire 35 Replacement Water Panel Humidifier Filter
  2. storage.googleapis.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2209190D (09.23), dealer-hosted copy, PDF p8 table: 'UNIT WATER PANEL PART NUMBER 300 35 400 45 500 10 600 35 700 35'
  3. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Page for the 600 (per its URL): Box contents: Model 35 Water Panel
  4. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    AprilAire 35 Replacement Water Panel For 300, 350, 360, 560, 560A, 568, 600, 600A, 600M, 700, 700A, 700M, 760, 760A, and 768 Whole-House Humidifiers ... Compatible Models: 300, 350, 360, 560, 560A, 568, 600, 600A, 600M, 600MKZ, 600KZ, 700KZ, 700MKZ, 700, 700A, 700M, 760, 760A, 768
  5. storage.googleapis.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2209190D (09.23), dealer-hosted copy, PDF p3: 'With bypass Models 400, 500, and 600 Series, HVAC system air is moved from the supply duct through the humidifier into the return duct'
  6. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    AprilAire 35 Replacement Water Panel
  7. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    INCLUDED IN THE BOX: 300 Humidifier ... Model 35 Water Panel
  8. 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 p20 (Models 760-768): 'Replace Water Panel evaporator annually with a new Water Panel evaporator (Stock No. 35)'

How many

  1. storage.googleapis.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2209190D (09.23), dealer-hosted copy, PDF p10: 'Replace the Water Panel (Water Panel 35 for Models 600 & 600M and Water Panel 10 for Models 500 & 500M) with a new genuine AprilAire Water Panel'

How often

  1. storage.googleapis.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2209190D (09.23), dealer-hosted copy, PDF p8: 'replace the Water Panel ... at least annually with the exception of Models 400 and 400M which should be changed at least twice per heating season'

Model variants

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Fits '300, 350, 360, 560, 560A, 568, 600, 600A, 600M, 700, 700A, 700M, 760, 760A, and 768 Whole-House Humidifiers'
  2. storage.googleapis.com Maker's own page checked Oct 1, 2026
    AprilAire owner's manual B2209190D (09.23), dealer-hosted copy, PDF p10: 'Water Panel 35 for Models 600 & 600M and Water Panel 10 for Models 500 & 500M'

Size

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Nominal 13H x 10W x 2D; actual 13H x 10W x 1.75D (inches)

What's in it

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Materials 'Aluminum, Synthetic Fiber'; 'heavy-duty aluminum mesh frame' with 'a porous ceramic-type coating'

Packs

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Package Size 1-pack, 2-pack, 4-pack, 10-pack; store SKUs '35', '35 02', '35 04', '35 10'

Other genuine options

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    H635EZ1A: '4330 Scale Control Insert, 4331 Distribution Tray, and 35 Water Panel'; 'For 600, 600A, and 600M'
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    H735EZ1A: '4236 Scale Control Insert, 4246 Distribution Tray, 35 Water Panel'; fits 700, 700A, 700M