What is dot rule on exhaust for a semi?
No part of the exhaust system can be located where the fumes could cause burning, charring, damage to the fuel supply, the wiring or any combustible section of the vehicle.
The system cannot discharge exhaust below the fuel tank or fuel tank filler pipe, forward of the semi's cab or below the cab or sleeper compartment.
The exhaust system must be securely fastened to the vehicle but may be installed on a hanger that allows for the movement of the system during the operation of the vehicle and that allows for the natural expansion and contraction of the exhaust fumes.
No wrap or patch can be used to repair. Only permanent repairs are allowed EG: welded in patches or pieces etc.
And don't forget the bewildering array of maximum noise laws across the country.
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