['CMV Parts and Maintenance']

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01/03/2025

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§393.83 Exhaust system

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§393.83 Exhaust system

RegSense Fleet Safety Federal Motor Carrier Safety Administration (FMCSA), DOT CMV Parts and Maintenance Focus Area Compliance Docs Standard Interpretation English Transportation USA

Interpretations to Part 393 — Parts and accessories necessary for safe operation

Question 1: Is a heat shield mandatory on a vertical exhaust stack?

Guidance: No. However, §393.83 requires the placement of the exhaust system in such a manner as to prevent the burning, charring, or damaging of the electrical wiring, the fuel supply, or any combustible part of the CMV.