Exhaust gas ducting used with engine-independent heater of motor vehicle has one-piece flexible inner helical pipe with sound-insulated perforated long section and encompassed gastight by one-piece flexible outer pipe
The whole exhaust ducting, including the silencer, is constructed by flexible helical pipes. The ducting has a one-piece flexible inner pipe(2) which has a perforated long section enclosed by a sound insulating material(4) such as rock wool or suchlike, and encompassed gastight by a one-piece flexib...
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