The Inventair MK3 3 Bag Dust Extractor is fitted with powerful, self-cleaning fans to transport the waste material through a ductwork system into the unit for separation. Upon entry, the unit bulk waste spins into the polythene bags then the finer dust filters through High Glaze Terylene Needlefelt media allowing the air to return to the working area without heat loss. Each unit is fitted with the Inventair special swirl baffles which ensure the polythene bags fill evenly with waste. The units are supplied with their own D.O.L starter and spare poly bags.