Industrial Air Filtration Pocket Bag Filter High Dust Filtration F7 Layers Non-Woven Fabric Bags Large filtration area, high air volume, low resistance, high dust holding capacity and low cost. Product Description Filter material and structure: It uses non-woven fabric made of synthetic fibers, featuring a fluffy and gradually denser fiber structure, which can effectively capture dust. The depth of the bag is generally 381mm, 500mm, 534mm, etc. Dust holding capacity and