US Patent 7491012 Road finisher

A road finisher with an internal combustion engine and an engine exhaust pipe has a muffler with an enlarged diameter with respect to that of the engine exhaust pipe, and a pipe for discharging emissions of a building material. The emissions pipe passes though the muffler mounted to the muffler without discharging into the muffler and the exhaust pipe output is supplied to the muffler interior and the muffler has a discharge pipe for the engine exhaust gases.