22
Horizontal vent/flue pipe terminations should be as shown in the following fig-
ure. Refer to
Vent/Flue Pipe and Combustion Air Pipe - Termination Locations
for details concerning location restrictions. The wall penetration should be
sealed with silicone caulking material.
NOTE: Terminate both pipes in the same pressure zone (same side of
roof, no major obstacles between pipes, etc.).
V
ENT
/F
LUE
& C
OMBUSTION
A
IR
P
IPE
L
ENGTHS
& D
IAMETERS
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 determining the number of el-
bows in the piping systems.
If the combustion air intake pipe is to be installed above a finished
ceiling or other area where dripping of condensate will be objection-
able, insulation of the combustion air pipe may be required. Use 1/2”
thick closed cell foam insulation such as Armaflex™ or Insultube™ where
required.
Vent & Combustion Air Intake Measurements for Standard Hori-
zontal 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.
VENT/FLUE TEE (
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
OPTIONAL)
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
12" MIN.
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
Figure 15
90º OR 45°
ELBOW
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
6” MAX
4” MIN
Standard Horizontal Terminations (Dual Pipe)
Figure 16
Combustion Air Intake may also be snorkeled to obtain 12” min ground clearance.
Alternate Vent Termination Above Anticipated Snow Level
(Dual Pipe)
Figure 18
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3”-24” BETWEEN PIPES
Alternate Horizontal Vent Termination (Dual Pipe)
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3” - 24”
Figure 17
