Get to Know What are Fabric Filters and Their Different Types

19 Feb

There are air pollution control devices called fabric filters, also called baghouses and bag filters, that remove particles of matter from a gas stream with the use of a layer of cloth. The particles of dirt and matter will deposit on the layer of cloth thereby letting clean air to pass through. In the industrial processes today, fabric filters are the most utilized as a removal device among the air pollution control technologies available in the market today.  

Note that fabric filters at can maintain a collection efficiency of 99% and even better especially when the particle size is very minute. This is a very good performance compared to electrostatic precipitators where performance may differ depending on the conditions of the process. There are three main types that fabric filters are categorize, and these are the shaker, reverse air and pulse jet. Each system is largely differentiated by the method in which the dust are collected from the filter surface.

The first type of fabric filter that we will briefly describe is the shaker. There is a mechanical shaker baghouses where tied onto a cell plate at the bottom of the baghouse are tubular filter bags and these are hanged from the horizontal beams at the top portion. When dirty gas enters the baghouse at the bottom part and then passes through the filter, dusts are collected on the inside of the bags. You can clean the baghouse of this type of shaker by shaking the top horizontal bar where the bags are being hanged. With the vibration of the motor-driven shaft and cam, it creates waves in the bags that will shake off the dust and dirt particles. For more facts and information about fabric filters, go to

The next type is the reverse air baghouses where the bags are tied onto a cell plate at the bottom of the baghouse and then tied or hanged from the top with an adjustable hanger frame.  As dirty gas flows normally, it enters the baghouse and passes from the inside through the bag, then the dust collects on the bags inside portion.

Another type is the pulse jet fabric filters where individual filters. These individual filters are supported by a metal or filter cage, each filter element is tied onto a cell plate at the top portion of the baghouse. Then as dirty gas goes inside the bottom of the fabric filter, it flows outside to inside of the individual filters where the dirt particles are collected. Pulse jet filters are said to advantageous than the shaker and reverse air filters at because they can be operated continuously and you can conduct cleaning without interrupting the flow.

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