Air purify ,enviromental protection and efficient. remove formaldehyde,benzene, remove ammonia and TVO Photocatalyst,photocatalyst filter,photocatalyst filter for range hood and air conditionFunctions1. Air purification: it can function as purifying hazardous organic substances, such as formaldehyde, benzene, ammonia, sulfur dioxide, carbon monoxide, nitric oxides that affect the human body in ...