... frame or metal frame, fiber material, net outside, v-type boxFiltration Grade:Hepa FilterMedium Material:fiber class and chemical fiber ... systems, fiber glass, high tempreture resistance and shock-resistance, or card paper, galvanized steel, medium densirt fiberboard,2, Grade: F6- ... manufacture filters accoeding to customer's all needs. V-type F7-H10 high efficiency pleated hepa filter for purification