After Filter is considered as integral part of oil mist collection unit. It plays significant role in removal of submicron particles and oil smoke. Usually, clip is used to fix this filtering component. This type of filter is made of filtering media that has been formed into multiple pleats. At the top of this filter, there is an injection molded end cap and molded base. Pleated media has support of aluminum mesh which is located at the outside. Long working life is one of its main aspects.