Anden Steam Humidifier with Model 5558 ControlAS35 STEAM HUMIDIFIER The Anden model AS35 is a high capacity electrode type humidifier which introduces steam into the facilities ductwork and relies on the HVAC system to distribute humidity throughout the facility. The steam humidifier has a capacity range between 11. 5 and 34. 6 gallons per day. Running on cold water, the Anden AS35 generates steam by energizing the two electrodes in the steam canister. Current flowing in between the electrodes