Filter bag or filter bag is a tool to separate dry particles from the gas (air) carrier. In the filter bag, the dirty gas flow of particles will enter into several filter loops (also called bags or cloth bags) which line parallel, and leave dust on the filter. The flow of dust and gas in the filter bag can pass through the fabric (fabric) in all directions. The dust particles are stuck on the dirty side of the fabric, while the clean gas will pass through the clean side of the fabric. The concentration of the inlet bag filter particles is between 100 μg / m3 - 1 kg / m3. Dust is periodically set aside from the bag by shaking or using inverse air flow, so that it can be said that bag filters are devices that accept gas containing dust, filter it, collect dust, and emit clean gas into the atmosphere.