... important 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 ... create a good working environment2.ues for air power equipment (fan, air compressor, boiler vent, generators, water ... distance transport and storage. 4 inch mini Efficient duct muffler