Fits checked Oct 1, 2026 · How we check
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AprilAire · humidifier · whole house fan powered

AprilAire 720 replacement filter

Use part HYDROL. Replace every 12 months.

The filter that fits

Maker lists this model

AprilAire HydroCore HYDROL

AprilAire HYDROL HydroCore Water Panel Cartridge

Part number
HYDROL
How many
1 per unit
How often
Replace every 12 months
Size
16 x 3.57 x 10.75 in16 x 3.57 x 10.75 in (actual)
Buy HydroCore HYDROL on AmazonManufacturer page

Opens an Amazon search for AprilAire HydroCore HYDROL. Check the listing says HYDROL.

See the sources

Does your exact model share this filter?

AprilAire labels several versions of the 720. Check the label on your unit.

  • 720 takes HYDROL
  • 720A same filter
  • 720M same filter
  • 720AKZ same filter
  • 720MKZ same filter

Look-alike models that take a different filter

The older 700 takes the separate panel 35, not the HydroCore cartridge.

Other genuine options from AprilAire

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

  • AprilAire HYDRLH Hard Water HydroCore Water Panel Maintenance Kit (HydroCore plus replacement orifice, for hard water)
    HYDRLH · Find on Amazon

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 HYDROL HydroCore™ Water Panel Cartridge For 620A, 620M, 720A and 720M Whole-House Humidifiers ... Compatible Models: 620A, 620M, 620AK, 620AKZ, 720A, 720M, 720AKZ, 720MKZ
  • How many shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Page for the 720A (per its URL): INCLUDED IN THE BOX: 720 Humidifier ... HYDROL L HydroCore ...; 'one-piece disposable HydroCore™ water panel cartridge'
  • How often shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Replace the HydroCore™ every 12 months to ensure the performance and longevity of your AprilAire 620 or 720 Humidifier
  • Size shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Materials: Plastic, Aluminum Actual Measurements: 16H x 3.57W x 10.75D (inches)
Show all 8 sources

Which filter fits

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    AprilAire HYDROL HydroCore™ Water Panel Cartridge For 620A, 620M, 720A and 720M Whole-House Humidifiers ... Compatible Models: 620A, 620M, 620AK, 620AKZ, 720A, 720M, 720AKZ, 720MKZ
  2. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Page for the 720A (per its URL): INCLUDED IN THE BOX: 720 Humidifier 60 Automatic Digital Control HYDROL L HydroCore
  3. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    AprilAire 720A Fan-Powered Evaporative Humidifier
  4. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    AprilAire HYDROL HydroCore™ Water Panel Cartridge
  5. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Page for the 620A (per its URL): INCLUDED IN THE BOX: 620 Humidifier 60 Automatic Digital Control HYDROL L HydroCore

How many

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Page for the 720A (per its URL): INCLUDED IN THE BOX: 720 Humidifier ... HYDROL L HydroCore ...; 'one-piece disposable HydroCore™ water panel cartridge'

How often

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Replace the HydroCore™ every 12 months to ensure the performance and longevity of your AprilAire 620 or 720 Humidifier

Size

  1. shop.aprilaire.com Maker's own page checked Oct 1, 2026
    Materials: Plastic, Aluminum Actual Measurements: 16H x 3.57W x 10.75D (inches)