exhaust system (10) of temperature class F600 with a tube section (20) with a first end (21) and a second end (22),with a first flange section (23) at the first end (21) and a second flange section (24) at the second end (22), and with an axial fan (30) with a valve tower (31) and an engine (24) in the tube section (20), that the engine (35) is housed directly in the air stream flowing through the tube section (20).
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