Part of an OHS requirement is to keep sustained noise levels within acceptable specifications. Wilkerson’s mufflers and oil reclassifiers keep these objectionable exhaust noises (air motors, control valves, etc.) within the OHS specifications. These units have only one inlet port. The contaminants in the exhaust flow are mechanically separated and twice filtered to 5 micron levels. The clean, muffled exhaust flows out of the unit under the metal hood on top.