INSTALLATION CONSIDERATIONS
18
installation. The number of elbows tabulated represents the
number 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.
Vent/Flue Pipe Terminations
The vent/flue pipe may terminate vertically, as through a roof,
or horizontally, as through an outside wall.
Vertical vent/flue pipe termination should be as shown in the
following figures. Refer to
Vent/Flue Pipe and Combustion
Air Pipe - Termination Locations
section in this manual or the
installation instructions for details concerning location restric
-
tions. The penetration of the vent through the roof must be
sealed tight with proper flashing such as is used with a plastic
plumbing vent.
NOTE: Terminate both pipes in the same pressure zone
(same side of roof, no major obstacles between pipes,
etc.).
RO
OF
LIN
E
COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
single pipe installation
TEE (OPTIONAL)
96
” M
AX
. -
3”
M
IN
.
12” MIN
HEIGHT DIFFERENCE
BETWEEN
INTAKE AND VENT
12” MIN TO ROOF OR HIGHEST
ANTICIPATED SNOW LEVEL
STRAIGHT
ELBOWS
Horizontal vent/flue pipe terminations should be as shown in
the following figure. Refer to
Vent/Flue Pipe and Combustion
Air Pipe - Termination Locations
section in this manual or the
installation instructions for details concerning location restric
-
tions. A 2 3/8" diameter wall penetration is required for 2"
diameter pipe while a 3 1/2" diameter hole is required for 3"
diameter 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 caulking material.
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
90º OR 45°
ELBOW
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
6” MAX
4” MIN
Standard Horizontal Terminations (Dual Pipe)