We are a professional HEPA、Dust & ParticleFilters、Carbon Filters、Filter Housings and Systems、air showermanufacturers of china.with good quality and cheap price. the follow is our products whichspecialize in. 1、PRE FILTER:F5 POCKET FILTER、 F6 POCKET FILTER、 F7POCKET FILTER、F8 POCKET FILTER、F9 POCKET FILTER 2、HEPA FILTER: H13H14H17 3、W type and efficient air filter 4、Head fan filter unit series 5、Air shower which is ISO 9001:2008 certified ,With competitiveprice and good quality.