GMEC96 Installation Manual
18
For installations at or above 7,000 feet altitude, use 3”
venting. Refer to the following table for applicable length,
elbows, and pipe diameter for construction of the vent/
-
secured to the combustion air intake to prevent inadvertent
be included when determining the number of elbows in the
piping system.
COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
single pipe installation
TEE (OPTIONAL)
9
6
”
M
A
X
.
-
3
”
M
I
N.
R
O
O
F
L
I
N
E
12” MIN
HEIGHT DIFFERENCE
BETWEEN
INTAKE AND VENT
12” MIN TO ROOF OR HIGHEST
ANTICIPATED SNOW LEVEL
STRAIGHT
ELBOWS
VENT/FLUE TEE (
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
OPTIONAL)
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
12" MIN.
If either a 90 degree or 45 degree elbow is used for
termination, it must be pointed downward.
or horizontally, as through an outside wall.
Vent/Flue Pipe and Combustion Air
Pipe - Termination Locations for details concerning location
restrictions. The penetration of the vent through the roof
with a plastic plumbing vent.
Vent/Flue Pipe and Com-
bustion 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
outside of the wall. The wall penetration should be sealed
with silicone caulking material.
Direct vent installations require both a combustion air intake
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
pipe terminations must be in the same atmospheric pressure