A device that filters particles from the air passing into an internal-combustion engine is called an air filter. In applications where air quality is important, air filters plays a pivotal role.

You will find air filters in forced air heating, ventilation and air conditioning systems.
In order to check and satisfy the Indoor Air Quality, the efficacy of good air filters plays an important part. Also, filters have to be serviced on a regular basis as the efficacy drops beyond a certain dirt-loading level.

Different types of HVAC filters are available today. They are not expensive and hence do not give satisfactory results. Also, for forced air heating and air conditioning systems, many filters are made from fiberglass. These filters are not that expensive and are disposable. They come in different sizes and densities as well. Less dense filters permits higher airflow, but removes less dust, whereas higher density filters restricts higher airflow but removes more dust. The load of dirt accumulates quickly in this regard.

Polyester and glass fibers are widely used to make air filters. With high temperature ratings of at least 120°C (250°F), both materials are widely used in commercial, industrial and residential applications.
A wide range of performance characteristics can be produced when polyester and glass fibers are mixed and combined with cotton or other fibers.

To enhance chemical resistance, Polypropylene is used as it has a lower temperature tolerance.

Microfibres (tiny synthetic fibers) are used in many types of HEPA (High Efficiency Particulate Air) filters.

Common types of filters are paper, foam and cotton.

Paper
For automobile engine air cleaners, pleated paper filters are the best choice because they are efficient, easy to service and affordable. An example of such a filter is a K&N Air Filter.

Foam
For engines on lawn mowers and other power equipment, oil-wetted polyurethane foam was the best choice earlier. These filters minimize restriction of air flow. Nowadays, these foam filters is used for off-road rallying and other motor sport applications where a high level of dust gets accumulated in no time.

Cotton
A small number of automotive air filters considered as high performance items use oil cotton gauze.





About the Author: Troy Channing loves cars and is an avid writer. His experience in car performance has lead to various articles written on everything from header installation to power chips. For more information on suspension parts, kits, K&N Air filters and other brands of high performance parts, go to Performance Center.