Made from the flame resistant fibre,it is aconfigurable,environmental friendly,and flame resistant product Flexibility,washable many times.Large dust holding capacity,long service life Gradual structure ,the fiber density increases gradually toward the pure air It can fully substitute for similar imported products Conform to European,chinese and Japanese classfications for the nonlflammablilith(eg:DIN 53438-F1,GB1977B1,JCAC NO.11A-2003)