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