Which filters does the Aprilaire 600 take?

Humidifier pad 35, Humidifier pad 4839, Humidifier pad H635EZ1A.

Aprilaire 600 humidifier filters: 35

Humidifier pad

Wicks harden with minerals and soak up less water over time.

Shop the humidifier pad on Amazon Other models that use 35

Humidifier pad

Wicks harden with minerals and soak up less water over time.

Shop the humidifier pad on Amazon Other models that use 4839

Humidifier pad

Wicks harden with minerals and soak up less water over time.

Shop the humidifier pad on Amazon Other models that use H635EZ1A

1Humidifier pad35

Part numbers come from Aprilaire (source 1, source 2, source 3), checked November 6, 2026. Amazon buttons open a search for the part number; we may earn a commission.

Where the model number is

On a label on the base, often under the water tank.

Other Aprilaire humidifiers

550a5585605608560a568600a600K600KZ600m