Pulse jet bag type dust collector working principle: dust-laden gas enters the system through the inlet and is filtered through the bag, depositing dust on the outside surface of the bag. During cleaning, the dust is removed by a blast of compressed air injected into the top of the opening of the filter bags. The air is supplied from a blowpipe which feeds into venturis located above the filter bag. The blast of high pressure air stops the normal flow of air though the filter.