Certificate:ISO9000:2000,ISO14000,SGS Filter material:chemical fiber price:factory competitive price Specificationscold ... resistance cardboard, (as client's request)4.materials:PP filter paper,non-woven,fiberglass,compound PP and PET materials. ... sterilization ,deodorization purpose. For the air purification machines and airconditioning uses, have an antibacterial effect, can effectively remove the ...