Md. Code Regs. 11.19.02.07

Current through Register Vol. 51, No. 12, June 14, 2024

Section 11.19.02.07 - Exhaust System

A. The exhaust system shall include the:

(1) Exhaust manifold and gaskets; and

(2) Piping leading from the flange of the exhaust manifold, to and including the muffler or mufflers and exhaust pipes.

B. The system may not extend into the body and shall be attached to the chassis.

C. Exhaust Pipes.

(1) The exhaust pipe shall be of nonflexible 16-gauge steel. An Original Equipment Manufacture flexible pipe or its equivalent not longer than 24 inches in length may be used at the front of the system at or near the turbocharger.

(2) The exhaust pipe shall exit the rear of the bus on either the left or right side of the emergency door.

(3) The exhaust pipe may not exit through or be attached to the bumper.

D. The complete exhaust system shall be tight and free from leaks, shall be properly insulated from the electrical wiring or any combustible part of the bus, and may not pass within 12 inches of the gasoline fuel tank or its connections unless a suitable heat baffle is installed between the exhaust system and gasoline fuel tank. A shield is not required between the diesel tank and exhaust. A part of the exhaust system may not pass within 12 inches of any flexible brake or diesel fuel line unless a suitable heat baffle is installed between the exhaust system and flexible brake or diesel fuel line.

E. The exhaust system noise level may not exceed the levels in COMAR 11.14.07.08E.

F. The manufacturer shall provide the proper size exhaust pipes. Replacement pipes shall be of the same diameter.

Md. Code Regs. 11.19.02.07

Regulations .07 amended effective April 3, 1981 (8:7 Md. R. 643)
Regulations .07 repealed effective June 1, 1987 (14:11 Md. R. 1261)
Regulations .07 adopted effective June 1, 1987 (14:11 Md. R. 1261)
Regulation .07C, E amended effective January 8, 1990 (16:26 Md. R. 2795)
Regulation .07C, F amended effective October 7, 1996 (23:20 Md. R. 1425)
Regulation .07A, C amended effective January 21, 2013 (40:1 Md. R. 20)