Simple Facts
on Air Filtration
... common terms and definitions.
Technologies
Dust Concentration Dust concentration expresses the mass of dust in a specified volume of air. Typical ambient conditions are around 0,1 milligrams per cubic meter (mg/m ³ ). Dirt road conditions are around 10 miligrams per cubic meter (mg/m ³ ). Laboratory Life This is the life of an air filter, until a defined restriction, tested at a constant dust concentration (mg/m ³ ) following an ISO 5011 laboratory test procedure to determine performance and allow comparison with other air filter models. Field Life This is the life of an air filter, till a defined final restriction, during its usage in the field. Differential Pressure The difference in pressure between two points, generally between the inlet and outlet of an air cleaner. To be measured in pascal (Pa). Pascal The SI unit to express a pressure, to be used instead of mm H 2 O. Pa (pascal) - kPa (kilopascal) - mbar (milibar) - daPa (decapascal)
RadialSeal™ RadialSeal refers to Donaldsons sealing technology, which uses the urethane end caps and the cleaners outlet tube to created the seal. This is the preferred method of sealing. Axial Seal The Axial Seal sealing method requires a force between air filter and air cleaner that provides enough compression on the gasket between the parts to create a seal.
Filtration Terms
Dust Capacity Dust capacity is the amount of contaminant that will be collected on a filter before final restriction level - as set by the engine manufacturer - is reached. Efficiency Efficiency is the percentage of dust that the air cleaner with a filter removed from intake air. Donaldson air cleaners have a 99,7% efficiency level. Restriction Restriction represents the resistance to the flow of air through the air cleaner system. Typical unit is kilopascal (kPa). Air cleaners with clean filters should have restrictions between 0,5 and 4 kPa. Filter media Filter media is the material in the filter that removes the contaminate. Conventional media is made from cellulose fibers combined with resins to keep the fibers together.
1 mm H 2 O
= 9,80665 Pa
1000 Pa 100 Pa
= 1 kPa = 1 mbar = 1 daPa
10 Pa
Airflow Requirements Air is as critical to the operation of an engine as it is to the working of the human body. Like lungs, an engine draws air from the atmosphere. The amount of air required by engine depends on the type of engine, whether there is a turbocharger, and the amount of horsepower of the engine. The airflow requirement is a specification of the engine that should be given by the engine manufacturer.
Engine Air Cleaners, Accessories & Service Parts n 11
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