Aprilaire 12 Humidifier Filter. Genuine OEM Aprilaire #12 humidifier filter for your Aprilaire whole house humidifier. The approximate size of this filter is 14.5 x 11.25 x 1.75. This item must be replaced at least once per year for optimal performance.Fits Aprilaire model 112, 224, 440, 445, 448 humidifiers.

This item is sometimes called a water panel, media filter, evaporator pad or humidifier pad. The manufacturer is sometimes referred to as April Aire, Aprilair, April Air but is correctly spelled Aprilaire.