Filter material is white or blue-white pre-filter media, G2/G3, washable and recycled. 
Aluminum/Galvanized/Cardboard frame, normal thickness: 21mm/25mm/46mm 
Face net: Paint-sided care net/Aluminum net 
Low resistance, large air flow and wide filtering area, long service life 
Application: Mainly used for filtering particles larger than 5um in the air, it is widely applied in air conditioning system and clean room for pre-filtration.