Bag filters are also called fabric collectors and are used to separate dust particles from air. The dust laden air enters the bag house and passes through fabric bags which act as a filter. These are most efficient and cost effective and can achieve a collection efficiency of more than 99% for very fine dust particles. For cleaning of the bag house, pressure jet cleaning is used. A high pressure blast of air

is used to remove dust from the bag. The blast enters the top of the bag tube, temporarily ceasing the flow of dirty air. The shock of air causes a wave of expansion to travel down the fabric. The flexing of the bag shatters and discharges the dust. The blast of compressed air must be powerful enough to ensure that the shock wave will travel the entire length of the bag and ensure the dust is removed completely.