Use only the temperature resistant flex-ducting that is included in the installation kit.
Install the heater air ducting in such a way that the hot outlet air will not be directed directly back to the air
intake since this will cause short cycling and temperature swings.
When the heater is mounted in a separate compartment or area than the main area to be heated, return air
ducting should be installed to maximize efficiency and allow for proper temperature control.
If not installing a return air duct and grill be sure to install the intake grill on the heater intake so that no debris
or foreign objects can be drawn into the heater.
Safety Warnings for Heater Ducting
The heater and the heater outlet ducting will get hot during operation. The heater and ducting must be
installed in such a way that they will not come in contact with any heat sensitive materials. Install shields
and covers as required. Be aware of things moving around in storage compartment while driving.
The heater and the heater outlet ducting must be installed in such a way that passengers or operators
cannot accidentally touch the hot heater or the hot air ducting. If required, protective covers or shields must
be installed.
The heater ducting outlet and inlet must be installed in such a way that they cannot be blocked or obstructed
and do the outlet does not direct the hot air too closely to anything heat sensitive.
Combustion Air Intake System Installation
The air intake must be installed in such a way that it cannot draw in water, debris, snow or ice into the
combustion chamber and so that it cannot be blocked at any time. The air intake should be pointed away
from the vehicle direction of travel.
The Combustion Air Hose inner Diameter is 25mm (1"). Be sure to install it on the air intake port on the
heater and not on the exhaust port. The minimum allowable length of the combustion air intake hose is
0.2m (8") and the Maximum is 1.5m (55").
Safety Warnings for Combustion Air Intake
The heater combustion air must NOT be taken from the passenger compartment, cargo space or operator
(driver) cabin.
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