HEAT OUTLET CONNECTION
A ventilation air duct should be 7.94 to 8.23" inside diameter and rated for continuous operation at 350F. Fasten four (4)
#10-32 UNF bolts (supplied with vehicle ducting) into the Heater Ventilation Air Outlet.
Figure 2-4. Ventilation Air Duct
Note: The duct should seat properly with the Vent Outlet Seal. Some resistance
may be felt as the duct compresses the seal.
Note: The Vent Outlet Seal MUST be replaced EVERY time the heater is re-installed
into a vent ducting system.