The selection of an air filter should be based on a desired result. You should determine the air quality you require and then purchase filters that will provide it. Every application for compressed air has a corresponding air quality. Manufacturers of modern production machinery and processes regularly specify a minimum air quality standard for their equipment. In many cases the successful and reliable operation of plant is dependent on that specified air quality. Compressed air purification can be defined as making air suitable for its application and the filters used should deliver that quality in the most cost effective way with the lowest possible pressure drop. The extensive range of filters available from SMC allows precise selection of the grade to suit the job - no more and no less.