15
tion restrictions. The penetration of the vent through the
roof must be sealed tight with proper flashing such as is used
with a plastic plumbing vent.
Horizontal vent/flue pipe terminations should be as shown in
the following figure. Refer to
Vent/Flue Pipe and Combustion
Air Pipe.
To secure the pipe passing through the wall and
prohibit damage to piping connections, a coupling should be
installed on either side of the wall and solvent cemented to a
length of pipe connecting the two couplings. The length of
pipe should be the wall thickness plus the depth of the socket
fittings to be installed on the inside and outside of the wall.
The wall penetration should be sealed with silicone caulk-
ing material.
NOTE: Terminate both pipes in the same pressure zone
(same side of roof, no major obstacles between pipes,
etc.).
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 com-
bustion 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
Concen-
tric Vent Termination
for specific details on termination con-
struction. For details concerning connection of pipes to the
furnace, refer to the
Vent/Flue Pipe and Combustion Pipe -
Standard Furnace Connections
or
Alternate Furnace Connec-
tions.
90º OR 45°
ELBOW
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
6” MAX
10”- 24”
4” MIN
Standard Horizontal Terminations (Dual Pipe)
Figure 15
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3” - 24”
Alternate Horizontal Vent Termination (Dual Pipe)
Figure 16
V
ENT
/F
LUE
& C
OMBUSTION
A
IR
P
IPE
L
ENGTHS
& D
IAMETERS
Refer to the following table for applicable length, elbows, and
pipe diameter for construction of the vent/flue and combus-
tion air intake pipe systems of a direct vent (dual pipe) instal-
lation. The number of elbows tabulated represents the num-
ber of elbows and/or tees in each (Vent/Flue & Combustion
Air Intake) pipe. Elbows and/or tees used in the terminations
must be included when determining the number of elbows 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 objectionable, insulation of the combustion air pipe
may be required.
Use 1/2” thick closed cell foam insulation such as
Armaflex™ or Insultube™ where required.
90°
ELBOWS
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
3”-24” BETWEEN PIPES
Combustion Air Intake may also be snorkeled to obtain 12” min
ground clearance.
Alternate Vent Termination Above Anticipated Snow Level
(Dual Pipe)
Figure 17
Содержание DM96SE
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