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5INSTALLATION WEBASTO THERMO 300
5-2
5.5 Exhaust Pipe Connection
Rigid exhaust pipe is recommended in installations where the use of an exhaust deflector is not suitable. The
exhaust pipe must have a minimum internal diameter no less than 2 3/4” (70mm) and a length no greater than 16’
(5m). The pipe may have several bends totaling no more than 270° overall. Do not cut and weld pipe to make 90°
angled corners. Always form sweeping corners and smooth transitions when forming bends in exhaust pipes.
1. Install exhaust deflector on heater exhaust outlet or install exhaust pipe.
2. Route the exhaust system so that the possibility of discharged exhaust gases entering the vehicle is prevented.
3. Direct the discharge opening of the exhaust system in such a way as not to be pointed in the direction of travel,
and so located that the possibility of clogging caused by snow, mud or debris is prevented.
4. Any condensation water collecting in the exhaust pipe must be discharged. If necessary, drill a drain hole at the
lowest point to allow drainage.
WARNING
Due to the danger of poisoning and suffocation, exhaust pipes are to be installed and routed in a manner that does
not permit the possibility of exhaust gases entering the vehicle where people are present. Carefully read and
understand all information pertaining to the installation of the exhaust system.
NOTE:
Webasto approved flexible exhaust tubing is available from your Webasto Thermosystems supplier under part
number 479721.
CAUTION
Route the exhaust system away from vehicle components that may be damaged by heat e.g., brake lines, electrical
wiring, coolant hoses and fuel lines.
5.6 Combustion Air Supply
Never draw combustion air from inside the passenger area of a vehicle, or from areas where fumes and gases can
accumulate.
Where the heater is installed in a sealed compartment, adequate ventilation for combustion air requirements
[4 in² (20 cm²)] must be provided.
Combustion air can be drawn from a remote (protected) area in order to provide a clean air supply. For installations
requiring remotely drawn combustion air, use approved ducting with an unrestricted internal diameter no less than 2
1/4” (55mm) and a length no greater than 16’ (5m). The ducting may have several bends totaling no more than 270°
overall. Approved combustion air ducting can be ordered through Webasto under part number 88729A.
To connect combustion air intake ducting [2 1/4” (55mm)] to the heater, several types of fittings are available that
snap directly onto the combustion air inlet port of the heater.
WARNING
Due to the danger of poisoning and suffocation, never draw combustion air from inside the driver and passenger
areas of the vehicle or from areas where hazardous fumes and gases can accumulate. Carefully read and
understand all information pertaining to the installation of the combustion air intake system.
CAUTION
Combustion air ducting and components must be non-restrictive. Do not connect to existing vehicle air ducting or
filtration systems.