Compressed air filters, often called in-line filters, are used to remove contaminants from compressed air after compression has occurred.When a filter is combined with a regulator and oiler, it is called an air unit. [1]The air leaving a standard screw or piston compressor is often high in water and

A particulate air filter is a device composed of fibers or porous material that removes solid particles such as dust, pollen, mold and bacteria from the air. Filters containing adsorbents or catalysts such as charcoal can also remove odors and gaseous pollutants such as volatile organic compounds o

​The largest use of non-woven filter media​ is for disposable filter elements. In most cases, the filter material is used as a depth filter medium. Three types of interchangeable filter elements are recognized.

The word composite comes from the Latin compositus, which means "woven together," meaning something made by combining different parts or materials. However, the definition of the term "composite" is confusing to members of the nonwovens and related industries.