18
STRAIGHT
ELBOWS
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16 D
Irect
V
ent
(D
ual
P
IPe
) P
IPIng
Direct vent
installations require both a combustion air
intake and a vent/flue pipe. The pipes may be run
horizontally and exit through the side of the building or run
vertically and exit through the roof of the building. The
pipes may be run through an existing
unused
chimney;
however, they must extend a minimum of 12 inches
above the top of the chimney. The space between the
pipes and the chimney must be closed with a weather
tight, corrosion resistant flashing. Both the combustion
air intake and a vent/flue pipe terminations must be in the
same atmospheric pressure zone. Refer to
Vent/Flue and
Combustion Air Pipe - Termination Locations
or
Concentric
Vent Termination
for specific details on termination
construction. For details concerning connection of pipes
to the furnace, refer to the
Vent/Flue Pipe and Combustion
Pipe - Standard Furnace Connections
or
Alternate Furnace
Connections.
90°
ELBOWS
3” - 24”
a
lternate
H
orIZontal
V
ent
t
erMInatIon
(D
ual
P
IPe
)
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Igure
17
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
6” MAX
4” MIN
s
tanDarD
H
orIZontal
t
erMInatIons
(D
ual
P
IPe
)
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13
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.
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14
COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
single pipe installation
TEE (OPTIONAL)
96”
MA
X. -
3”
MIN
.
ROO
F LIN
E
12” MIN
HEIGHT DIFFERENCE
BETWEEN
INTAKE AND VENT
12” MIN TO ROOF OR HIGHEST
ANTICIPATED SNOW LEVEL
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15
