EXAIR's Cold Mufflers for Vortex Tubes help to reduce work area noise produced by air that is exhausting from EXAIR Vortex Tubes. Per OSHA standard 1910.95, a worker must not be exposed to sound levels above 90 dBA for any eight hour shift of a 40 hour work week. Cold Mufflers for Vortex Tubes help plants meet this OSHA requirement by reducing the sound to safe levels below 90 dBA.