The device is designed to extract and purify the air from dry, non-sticky, chemically non-aggressive and non-explosive dust. It can be used to protect several workplaces (workplace ventilation). The main filtering elements are filter cartridges cleaned automatically with a compressed air impulse. Initial separation is performed by a multi-cyclone system. Thanks to the high filtration efficiency (99.9%), the purified air can recirculate in rooms (the air is ejected from the device in four directions with 315 mm diameter stub pipes).