scion air filter is a device which removes solid particulates such as dust, pollen, mold, and bacteria from the air.Air  are used in applications where air quality is important, notably in building ventilation systems and in engines, such as internal combustion engines, gas compressors, diving air compressors, gas turbines and others

• The cabin air  is typically a pleated-paper  that is placed in the outside-air intake for the vehicle's passenger compartment. Some of these filters are rectangular and similar in shape to the combustion air filter. Others are uniquely shaped to fit the available space of particular vehicles' outside-air intakes. Being a relatively recent addition to automobile equipment, this filter is often overlooked[citation needed].Clogged or dirty cabin air filters can significantly reduce airflow from the cabin vents, as well as introduce allergens into the cabin air stream.Oil-wetted polyurethane foam elements are used in some after market replacement automobile air filters. Foam was in the past widely used in air cleaners on small engines on lawn mowers and other power equipment, but filter automotive-type paper filter elements have largely supplanted oil-wetted foam in these applications. Depending filter on the grade and thickness of foam employed, an oil-wetted foam filter element can offer minimal airflow restriction or very high dirt capacity, the latter property making foam filters a popular choice in off-road rallying and other motor sport applications where high levels of dust will be encountered filter.

Oil bath air cleaners were very widely used in automotive and small-engine applications until the widespread industry adoption of the paper filter in the early 1960s. Such cleaners are still used in off-road equipment where very high levels of dust are encountered, for oil bath air cleaners filter can sequester a great deal of dirt relative to their overall size, without loss of filtration efficacy or airflow. However, the liquid oil makes cleaning and servicing such air cleaners messy and inconvenient, they must be relatively large to avoid excessive restriction at high airflow rates, and they tend to increase exhaust emissions filter of unburned hydrocarbons due to oil aspiration when used on spark-ignition engines filter .