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If you are using a remote muffler it should be mounted as close to the engine as possible, since it will clog
with carbon if it's operating temperature is too low.
If you are using a remote muffler a flexible coupling of 12" or more must be installed between the exhaust
line and the manifold to absorb the engine's vibration.
However, a short, solid section of pipe between 6" and 8" long should be placed between the connection
of the manifold and the flexible coupling. This nipple will reduce the possibility of the hot gases burning up
the flexible coupling.
Water is one of the by-products of combustion and will be present in the exhaust piping or muffler. This
water must be kept from draining back into the engine. Slanting the horizontal section of the exhaust
system piping downward slightly, away from the engine can do this.
A water trap consisting of a tee extension with a drain cock should also be provided. This water trap
should be located between the flex coupling and the muffler, but as close to the engine as possible on a
horizontal section of the exhaust piping.
It is also recommended that an exhaust rain cap be used whenever it is possible that rain could get into
the system. This will help to prevent corrosion and damage to the exhaust system and engine.
The exhaust system is subject to the engine's vibration and it must therefore be solidly secured to prevent
unnecessary stress and the potential for breakage.
The engine's exhaust system is the hottest component of the installation and extreme care and
considerations must be given to it.
Whenever possible the remote muffler should be located outside of the building or compartment. As much of
the exhaust piping as possible should be located within the engine's heated cooling are exhaust flow. This
will help to prevent the accumulation of radiant exhaust heat inside the building.
In some cases, the idea of mounting the muffler outside the building conflicts with the idea of mounting the
muffler close to the engine to prevent carbon buildup. In these cases it is best to mount the muffler near
the engine and provide an air flow around the muffler to evacuate the muffler's radiant heat out of the
compartment or building. However, the exhaust outlet must be extended outside of the building.
Under no
conditions shall the exhaust outlet be positioned so
that the exhaust gases would be directed towards any openings
or air entry routes (doors, windows, vents, etc...) of an occupied
building.
When discharging the hot exhaust gases out of the building do
not direct them towards anything that could catch fire or explode.
If the remote muffler cannot be located outside of the building or compartment, the next best option is to
locate it in the engine's heated cooling air exhaust flow.
It is extremely important that you do not allow the hot exhaust gases to re- circulate back into the engine's
cooling air intake.
It is important to keep any and all
flammable objects or
materials away from the generator set, the remote muffler
and its attached piping, as well as any other potentially
hot component of the installation.