TM 10-4520-262-12&P 0005 00
0005 00-20
Installing The Air Supply And Return Ducts. Remove dust covers (1) from heater assembly duct
adapters (2). Make sure that each of the duct adapter assemblies are securely attached to the heater
housing assembly by two fasteners (3). The fasteners must be tightened securely and in the locked
position.
WARNING
During heater operation, air leaving the heated air outlet of the heater and passing
through the heated air inlet duct (with debris grill) may exceed 220°F (104°C). Make sure
tent personnel are aware of burn hazards and equipment hazards presented by the
heated air and the debris grill. To ensure proper air flow, air duct color code inspection is
critical.
Locate the heated air return duct (4). The heated air return duct (4) will have an air flow arrow pointing
toward the debris grill (5). Make sure inside and outside of duct and the debris grill are free of damage,
dirt, and obstructions prior to attachment to the heater assembly. Insert the debris grill end (5) of the duct
into the tent duct tunnel (6) closest to the exhaust outlet end (7) of the heater as indicated by the label
“Heated Air Outlet” on the upper housing assembly. Secure the tent duct tunnel tie straps (8). Do not
secure the straps so tightly that the air flow within the duct is restricted. Attach the open end of the duct to
the duct adapter (9) on the outlet side of the heater. This is the end of the heater closest to the exhaust
outlet (7). Tighten the duct strap (10) securely on the duct adapter (9).
Locate the air supply duct (11). The air supply duct (11) will have an air flow arrow pointing away from the
debris grill. Make sure inside and outside of duct and the grill are free of damage, dirt, and obstructions
prior to attachment to the heater assembly.
Insert the debris grill end (12) of the duct into the tent duct tunnel (13) closest to the breathable air inlet of
the heater as indicated by the label “Breathable Air Inlet” (14) on the upper housing assembly. Secure the
tent duct tunnel tie straps (15). Do not secure the straps so tightly that the air flow within the duct is
restricted. Attach the open end of the duct (16) to the duct adapter (17) on the breathable air inlet side of
the heater. This is the end of the heater farthest from the exhaust outlet (7). Tighten the duct strap
securely on the duct adapter (17).
