Section 300.40. Exhaust system.

 

(1)  The exhaust system, which includes the exhaust manifolds, joining gaskets, piping leading from the exhaust manifold, muffler and tail pipe may not enter the bus body at any location. The exhaust system pipes shall be of nonflexible steel except that those buses which utilize a diesel engine may be equipped with a flexible pipe of not more than 18 inches long between the engine and the first exhaust pipe hanger. Stainless steel bellows assemblies are allowed. School buses with 2007 EPA or newer diesel engines, subject to emissions standards in 40 CFR 86.007 - 11 , may have flexible tubing at original manufactured locations and if replaced must meet or exceed manufacturer specifications.

(1m)  School buses equipped with an EPA 2007 or newer diesel engine, which is subject to emissions standards in 40 CFR 86.007 - 11 , shall maintain or exceed original specifications equipped by the manufacturer and shall discharge exhaust to the rear or left side of the school bus.

(2)  An exhaust system that has its exit on the left side shall have the exit point located no further forward than behind the driver's position.

(3)  An exhaust system, that is not an EPA 2007 or newer diesel engine, subject to emissions standards in 40 CFR 86.007 - 11 , may discharge out of the right if located behind the rear wheels.

(4)  An exhaust system that exits at the rear shall extend to, but not beyond, the rear limit of the bumper.

(5)  Every exhaust system exit shall extend to, but not over one inch beyond the body limits of the bus. The exhaust shall be directed to prevent an accumulation of exhaust gases underneath the bus.

(5m)  Buses equipped with diesel engines may be equipped with a turn-down exhaust pipe. The turn-down exhaust pipe may not exceed 6 inches forward of the rearmost part of the bus.

(6)  The complete exhaust system shall be tightly connected and free from leaks.

(7)  All emission control systems, components and parts shall be maintained in accordance with manufacturer's specifications.

(8)  School buses operated in interstate commerce shall comply with 49 CFR 393.83 , exhaust system location.

Cr. Register, February, 1983, No. 326 , eff. 3-1-83; am. (1), (5), cr. (5m), (7), (8), Register, February, 1995, No. 470 , eff. 3-1-95 ; am. (1) and (5m), Register, December, 1997, No. 504 , eff. 1-1-98; CR 15-069 : am. (1), cr. (1m), am. (3) Register April 2016 No. 724 , eff. 5-1-15.