67 Pa. Code § 171.21 - Exhaust system
(a)
General rule. The exhaust pipe, muffler and tailpipe shall be
outside the body compartment and securely attached to the chassis with clamps
and hangers of a type and installed as recommended by the chassis
manufacturer.
(b)
Tailpipe. The tailpipe shall be constructed of a
corrosion-resistant tubing material at least equal in strength and durability
to 16 gauge steel tubing.
(c)
Tailpipe extension. The exhaust system of a school bus powered
by a gasoline engine shall discharge to the atmosphere at or within 6 inches
forward of the rearmost part of the school bus.
(d)
Tailpipe extension for school
buses using fuels other than gasoline. The exhaust system for a school
bus using fuels other than gasoline shall discharge to the atmosphere either at
or within 15 inches forward of the rearmost part of the vehicle; or to the rear
of all doors or windows designed to be opened, except windows designed to be
opened solely as emergency exits.
(e)
Insulation. The exhaust
system on a gasoline powered chassis shall be properly insulated from fuel tank
connections by a securely attached metal shield at any point where it is 12
inches or less from the tank or tank connections.
(f)
Muffler. The muffler
shall be constructed of corrosion resistant material.
(g)
Discharge lines and
outlets. The discharge lines and outlets on school buses equipped with
compressed or liquefied gas fuel systems shall be installed in accordance with
Chapter 175 (relating to vehicle equipment and inspection).
(h)
Exhaust system hangers.
Exhaust systems may be equipped with hangers that permit required movement due
to expansion and contraction caused by heat of the exhaust and relative motion
between the engine and chassis of a vehicle.
(i)
Exhaust system and discharge
location. Exhaust systems are not permitted to discharge to the
atmosphere at a location immediately below the fuel tank or the fuel tank
filler pipe. Exhaust systems shall also extend and discharge completely to the
outside edge of the vehicle body.
(j)
Exception. This section
does not apply to auxiliary fuel-fired heating systems.
Notes
The provisions of this § 171.21 amended under the Vehicle Code, 75 Pa.C.S. §§ 4103, 4551-4553 and 6103.
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