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Air filters are found in most all forced-air heating, ventilation, and air conditioning systems. The efficacy of the air filters in such systems significantly affects the Indoor Air Quality. Building industry recommended practices and government guidelines contain minimum recommended efficiency ratings for air filters. For example, the US Department of Energy recommends air filters with a Minimum Efficiency Reporting Value (MERV) of 13 as determined by the ASHRAE 5.2.2-1999 test protocol, and LEED advises builders similarly, and ASHRAE recommends MERV 6 or higher air filters to control the amounts of pollen, mold, and dust that reach the wet evaporator coils in air conditioning systems. Wet coils contaminated with high levels of pollen and dust can allow mold colonies to grow.
Since efficacy drops beyond a certain dirt-loading level, filters must be serviced regularly. There are a variety of different types of HVAC filters available. Many are inexpensive and not very efficient. Many in-duct filters for home forced air heating and air conditioning systems are made from loosely-spun fiberglass. These filters are inexpensive, disposable, and come in various densities and sizes. Less-dense filters allow for higher airflow, but do not remove as much dust. Higher density filters remove more particles, but are more resistrictive of airflow. They also become more quickly loaded with dirt. Car air purifiers with auto ionic breeze are useful as car air cleaners. They are cheap, portable and silently devices.
Polyester and/or glass fibres are commonly used to make air filters. Both materials have high temperature ratings of at least 120°C (250°F), and are widely used in commercial, industrial and residential applications. Polyester and glass fibres can be blended with cotton or other fibres to produce a wide range of performance characteristics. In some cases
