... other harmful gases 2.subside smoke 3.beautiful design room air freshenerA. technical parametervoltageac 220v/12vpowder5w(wind veiocity: strong ... smoking harm5.mildew and moth proof6.refresh the air,refresh mind,balance internal recycling and improve environment ... grade C.application fields:home,office,meeting room,hospital,hotel,school,kindergarten,supermarket,cafe,dining hall, ...