15
Combustion Air Intake Options (See Figure 12)
The RF000142 coupling (Figure 8) can be secured directly
to the furnace intake coupling if condensation is a concern.
If the RF000142 is used on the combustion air inlet, it must
be installed with the arrow pointing up. It should be noted,
the combustion air will actually be moving in a direction
opposite of the arrow on the RF000142 coupling. It must
have a field supplied, trapped drain tube free-draining to
proper condensate disposal location. A loop in the drain
tube can serve as a trap. The unused RF000142 drain
fitting should be capped. A tee installed in the intake pipe
is also an acceptable method of catching condensation. It
must have a field supplied, trapped drain tube or pipe, free-
draining to proper condensate disposal location. A loop in
the drain tube can serve as a trap.
Combustion Air Intake Options
Figure 12
CAUTION
Be sure not to damage internal wiring or other components
when reinstalling coupling and screws.
NOTE: For installations at or above 7,000 feet
altitude, use 3” venting.
Vent/Flue Pipe Terminations
12" MIN.
VENT/FLUE TEE (
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
OPTIONAL)
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
Figure 13
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
6” MAX
4” MIN
Standard Horizontal Terminations (Dual Pipe)
Figure 14
Vent Pipe
Use alternate vent
& combination
air locations
Combustion Air Pipe
Field Supplied
Drain Tee on Vent Pipe
Condensate trapped
to prevent flue gas from escaping
and routed to field supplied
condensate disposal
1/4” per foot min.
slope to furnace
6’ Max.
Floor
Basem
ent / C
rawlsp
ace
DOWN VENTING UPFLOW MODEL FURNACES ONLY
All piping and fittings must be joined per material manufacturers specifications
to prevent separation and flue gas leaks.
Figure 15
