Which filters does the Aprilaire 112 take?

Humidifier pad 12, Humidifier pad HC18P1009.

Aprilaire 112 humidifier filters: 12

Humidifier pad

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

Shop the humidifier pad on Amazon Other models that use 12

Humidifier pad

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

Shop the humidifier pad on Amazon Other models that use HC18P1009

1Humidifier pad12

Part numbers come from Aprilaire (source), checked November 6, 2026 and Honeywell (source), 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

110136220224300350360