The cutting, pleating and tailoring of the filtration media is mostly an automated process. It is very important that the filter medium fits perfectly into the shape of the filter housing or frame. It there are any small holes, which enable the air stream to bypass the filter medium, the filtration efficiency will decrease. If the filter media are too big or there is insufficient tension for the filter medium in the filter, the filter medium will be damaged because of friction of faults. Depending on the application, filters are either pleated, draped and placed in a frame or are supported by a fabric or a cage. Typical forms used for surface filter are tube filters, compact filters and cartridge filter. For depth filters, filter nonwoven such as filter mats, filter cells, bag filters and compact filter elements are produce.