DESIGN GUIDELINES FOR OUTSIDE COMBUSTION AIR CONNECTION
1.For installations with horizontal
2.Connection to outside the house is REQUIRED for mobile home installations. We strongly urge use of the 69FAK Fresh Air Kit.
90 DEGREE BEND TERMINATION
2” Min. Diameter
NOTE:
A wire mesh screen with a maximum
opening size of 3/8” must be
installed in the pipe or elbow for
rodent exclusion.
WIND HOOD TERMINATION
Wind Hood
| 3” |
2” | 6” |
3.Only noncombustible pipe 2 inches (or greater) in diameter is approved to use for outside air connections (straight or flexible). PVC pipe is NOT approved and should NEVER be used.
4.If the air inlet is connected to the outside, it MUST be terminated with a vertical
5.Blockage, excessive length, or extra bends in the air intake pipe will starve the heater of combustion air. A
CAUTION: The operation of exhaust fans such as bath room fans, attic fans, etc. might starve the heater of combus- tible air creating a negative pressure in the room. Provide adequate ventilation in the room accompanying the heater. If not, the pressure switch may shut off operation of the heater. (Due to negative pressure)
USSC | 11 |