Warehouse roof dust in dust concentration 200 mm / cubic feed -3000 mg / cubic meter; its resistance is not more than 65 kg / m, its collection efficiency of up to 100% dust removal equipment www.sdlqhbsb.com warehouse roof. is a round metal removable cartridge, there are 14 circular holes embedded in the floor, it has 14 filters, fastened at the upper end of a vibrator hanger, regular vibration, so that the filter retention down dust landed in the warehouse.