Commonly known as bag houses, fabric collectors use filtration to separate dust particulates from dusty gases. They are one of the most efficient and cost-effective types of dust collectors available, and can achieve a collection efficiency of more than 99% for very fine particulates.

Dust-laden gases enter the bag house and pass through fabric bags that act as filters. The dust particles accumulated on the surface of the filter bags are cleaned either by purging compressed air, or by a motorized shaking, or by a manual shaking mechanism. In the compressed air mechanism, the compressed air from an air tank is purged to individual filter bags through piping network intermittently with the solenoid valves and electronic timer. During normal dust collection process, dusty air flows through the filter and solid layer of dust forms on the filter surface. A quick bust of compressed air is shot through the filter media in the opposite direction of the dusty air stream, knocks the accumulated dust, which then falls in to bottom hopper. The accumulated dust particles in the bottom hoper is either collected in a dust bin or discharged to a conveyorised network through rotary air lock.