Be attached to the furnance or air conditioning system, the steam is driven into each room through the air duct. Suitable for the space of 600-6000 sq.feet, this humidifer generates sterile steam to humidifying the whole house and makes the house more comfortable. Power Supply is AC 200-240V, 50-60hz. Steam capacity is adjustable between 6-25 Gallon a day. It uses normal tap water, doesn"t need any water treatment device. It is easy to install, just follow the installation, operation and maintainance manual.