Honeywell 17gpd By-Pass Humidifier with H8908A Humidistat Humidifier pad is coated with AGION antimicrobial agent. Preassembled for quicker installation. Small footprint, light weight and reversible components allow for easy mounting on either warm air supply or cold air return of any forced air furnace. Interior components designed for quick maintenance and service. Option of automatic humidity control or standard humidistat.