In pneumatic conveying systems handling fine or dusty material, the method of filtration thathas become almost universally adopted is a bag type fabric filter. These filters are commonlycalled baghouses. Most baghouses use long, cylindrical bags (or tubes) made of woven orfelted fabric as a filter medium.During cleaning, dust that has accumulated on the bags is removed from the fabric surfaceand deposited in the hopper for subsequent disposal. Depending on the typeconstruction ofbaghouse, cleaning can be carried out while the baghouse is on-line (filtering) or is off-line(in isolation).Standard fabric filters can be used in pressure or vacuum service, but only within the range of about 640 millimeters of water column (25 inches of water column). Well-designed and operated baghouses have been shown to be capable of reducing overall particulate emissions to less than 0.05 gm3(0.020 grft3 ), and in a number of cases, to as low as 0.002 to 0.011 gm3 (0.001 to 0.005 grft3).
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