It is compounded by special production process with modified activated carbon filled in two layers of non-woven fabrics.It can filter tiny particles in the air, pollen, bacteria, industrial waste gases and dust, etc., and prevent such substances from entering the air-conditioner to destroy the air-conditioning system and endangering human health in the vehicle.According to the requirements of customers, filter screens that can effectively remove harmful substances such as PM2.5, formaldehyde and TVOC can be customized.