... filter B) Large dust holding capacity C)Economical and practical Washable pre air filter,pre air filter ,plank air filter A ... filter3) Frame: Aluminum or galvanized, with dismountable frame design4) Media: Washable synthetic fiber, can be washed 6-8 times5) Protect mesh ... orders of non-standard specifications, but the prices separately negotiable Washable pre air filter,pre air filter ,plank air filter