The Honeywell HC22E 1003 Filter is the correct replacement filter pad for the following humidifier models:
The Honeywell HC22E 1003 Enviracaire Humidifier Filter is a replacement Honeywell filter for the Honeywell HE220 and HE225 Bypass Flow-Through Humidifiers, and the Aprilaire 550 Humidifier. The Enviracaire filter features Agion Antimcrobial Protection to prevent bacteria and microbial growth. This Honeywell humidifier filter is a genuine Honeywell replacement part. With the HE220A filter you'll have your humidifier operating at peak capacity.
Honeywell HC22E 1003 Enviracaire Humidifier Filter specifications:
For the best results your Agion filter should be replaced at least once per year, preferably prior to the start or end of the heating season.