Single layer sponge/foam/PU air filter: (1)Specialized in the production for nearly 20 years. (2)Own facotry. (3) pass SGS. Single layer sponge/foam/PU air filter:Products are widely used in the fields of chemistry, sanitary, medical, Architecture, household electrical appliances, aquarium, autos and motors, sewage and petroleum treatment for filtering, protecting, decorating, straining, cleaning ...