Do you feel dryer when you sit in room or office? Do you feel uncomfortable when you in dry atmosphere? Maybe an air humidifier is your best choice. Air humidifier will solve this problem that your house becomes dry and uncomfortable. This round air humidifier unit is low maintenance, cost effective, and is simple to operate. Cut down power supply when waterflooding in the air humidifier. When the temperature below 0 °C, pour out the water which in water box and channel. Frozen water would damage the air humidifier equipment and parts. Hard utensil must away from the concussion energy change piece, only soft cloth is available. Chemical solvent, oil, kerosene, polishing powder is forbidden to wipe the surface. The black air humidifier mounts on supply plenum or return. By-pass carries air from supply, through humidifier. This cartoon air humidifier is suitable for use in bedroom, living room and office. This round air humidifier also can be a perfect gift.