Aprilaire 10 Humidifier Filter (5 Pack). Genuine OEM Aprilaire #10 water panel for your Aprilaire whole house humidifier. The approximate size of this filter is 9.75 x 9.75 x 1.75. This item must be replaced at least once per year for optimal performance. Fits Aprilaire model 110, 220, 500, 550, 558 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.