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12" MIN.
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
V
/F
& C
ENT
LUE
OMBUSTION
If there is a difference between the vent and combustion air
pipes, count the pipe with the most fittings. Elbows and/or
tees used in the terminations must be included when determin-
ing the number of elbows in the piping systems.
If the combustion air intake pipe is to be installed above a fin-
ished ceiling or other area where dripping of condensate will be
objectionable, insulation of the combustion air pipe may be re-
quired. Use 1/2" thick closed cell foam insulation such as
Armaflex™ or Insultube™ where required.
6" MAX
4" MIN
90º OR 45°
ELBOW
Standard Horizontal Terminations (Dual Pipe)
Figure 16
Vent & Combustion Air Intake Measurements for Standard
Horizontal Terminations (Dual Pipe)
Center to center = 10" min / 24" max.
Vertical separation: 0" - 24"
Vent termination from wall = 8" min / 12" max.
Combustion air intake from wall = 6" max.
Vent and intake clearance to ground
or anticipated snow level = 12" min.
22
VENT/FLUE TEE (
OPTIONAL)
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
Figure 15
A
P
L
& D
IR
IPE
ENGTHS
IAMETERS
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
Alternate Horizontal Vent Termination (Dual Pipe)
Combustion Air Intake may also be snorkeled to obtain 12" min ground clearance.
Alternate Vent Termination Above Anticipated Snow Level
Figure 18
V
/I
T
ENT
NTAKE
ERMINATIONS
D
V
F
IRECT
ENT
URNACES
If more than one direct vent furnace is to be installed verti-
cally through a common roof top, maintain the same mini-
mum clearances between the exhaust vent and air intake
terminations of adjacent units as with the exhaust vent and
air intake terminations of a single unit.
If more than one direct vent furnace is to be installed horizon-
tally through a common side wall, maintain the clearances as
in the following figure. Always terminate all exhaust vent
outlets at the same elevation and always terminate all air
intakes at the same elevation.
90°
ELBOWS
3" - 24"
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEV EL
Figure 17
90°
ELBOWS
3"-24" BETWEEN PIPES
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
(Dual Pipe)
F
I
M
OR
NSTALLATION OF
ULTIPLE
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