... 2.easy to install. 3.size:6" mini. 4.need less room. 6" efficient duct Muffler1.uses,reduce the ... measures. Muffler is installed on the air power equipment (such as fan, air compressor, boiler vent, ... generators, water pumps and other vent noise larger equipment) of gas flow path or into the exhaust ... a good working environment 2.ues for air power equipment (fan, air compressor, boiler vent, generators, ...