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The vacuum filters are recommended when there are lower hygienic requirements in the facility and no food requirements or antistatic properties are needed. They are lightweight, made of plastic, and have a filter grade of 5-10 µm. They may be used where extra venting is required (due to material characteristics or the process setup). One example is to cover the venting hole on transition pieces (3) under the conveyor body (1) when the material is emptied into a silo/hopper (4) or other equipment. In this case, venting is needed to ensure a smoother material transition as the vent evens the pressure.