Air Compressor Services' 5.6143.0 Filter Mat Replacement filter was specifically designed to replace the Kaeser branded filter mat part number 5.36143.0. Some enclosed air compressors come equipped with a filter mat that performs two important functions. First the filter mat can help dampen the noise of the air compressor. It also provides an additional line of defense in your compressed air system against dust and dirt in the air. Changing filter mats should be part of your routine maintenance and should be changed regularly depending on ambient air conditions.