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8 USSC
For installations with horizontal through-the-wall exhaust, it is strongly recommended that the stove combustion air be
connected to the outside. If the home is newer or has been tightly insulated it is required to install outside combustion
air. If you do not, then bring a 4-6 inch intake into the furnace room in the basement.
Connection to outside the house is REQUIRED for mobile home installations.
Only noncombustible pipe 3 inches in diameter is approved to use for outside air connections (straight or flexible). PVC
pipe is NOT approved and should NEVER be used.
If the air inlet is connected to the outside, it MUST be terminated with a vertical 90-degree bend (down) or with a wind
hood. Failure to do so could result in a burn back during high winds blowing directly up the air inlet during a simulta-
neous power failure (see diagram above).
Blockage, excessive length, or bends in the air intake pipe will starve the stove of combustion air. A 90-degree bend is
equivalent in restriction to approximately 30 inches of straight inlet pipe.
DESIGN GUIDELINES FOR OUTSIDE COMBUSTION AIR CONNECTION
1)
2)
3)
4)
5)
90 DEGREE BEND TERMINATION WIND HOOD TERMINATION
Wind Hood
3” Min. Diameter
3”
2”
6”
CAUTION: The operation of exhaust fans such as bath room fans, attic fans, etc. might starve the heater of combustible air
creating a negative pressure in the room. Provide adequate ventilation in the room accompanying the heater.