18
The vent termination of a direct vent application must
terminate at least 12” from any opening through which
flue gases may enter a building (door, window, or gravity
air inlet).
The vent termination of vent pipe run vertically through
a roof must terminate at least 12” above the roof line (or
the anticipated snow level) and be at least 12” from any
vertical wall (including any anticipated snow build up).
A vent termination shall not terminate over public
walkways or over an area where condensate or vapor
could create a nuisance or hazard or could be detrimental
to the operation of regulators, relief valves, or other
equipment.
The combustion air intake termination of a direct vent
application should not terminate in an area which is
frequently dusty or dirty.
Vent & combustion air pipes may terminate vertically
through a roof, or horizontally through an outside wall.
The combustion air intake and vent pipe terminations
must be in the same atmospheric pressure zone. Vertical
vent pipe terminations should be as shown in figure 14.
The penetration of pipes through the roof must be sealed
water tight with proper flashing such as is used with a
plastic plumbing vent.
Horizontal vent pipe terminations should be as shown in
the following figures. 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 caulking material.
12"
Non-Direct Vent
Vent/Flue Termination
No Terminations
Above Walkway
12"
min.
4'
min.
Non-Direct Vent
Vent/Flue Termination
Direct Vent
Vent/Flue Termination
<10'
Forced Air
Inlet
Non-Direct Vent
&
Direct Vent
Vent/Flue Terminations
Grade or Highest
Anticipated
Snow Level
3' min.
12" min.
4' min.
12" min.
Vent Termination Clearances
Figure 13
COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
single pipe installation
TEE (OPTIONAL)
9
6
” M
AX.
-
3”
M
I
N.
R
OOF
L
I
NE
12” MIN
HEIGHT
DIFFERENCE
12” MIN TO ROOF OR
HIGHEST ANTICIPATED
SNOW LEVEL
Figure 14
STRAIGHT
ELBOWS
Figure 15
Horizontal Termination (Single Pipe) Above
Highest Anticipated Snow Level
Figure 16