Dusty gas under negative pressure from the duct into the lower hopper, in front of the air intake □ with a spoiler, large particles of dust and carom by gravity into the hopper, fine particles of dust after bag filter adsorbed on the inner wall of the bag, the purified gas through the bag room, top of the device through the switching valve through the exhaust pipe sucked into the fan, and then the exhaust pipe into the atmosphere.
