Goodman GMVM Service Instructions Manual page 29

PRODUCT DESIGN
If the combustion air intake pipe is to be installed above a finished
ceiling or other area where dripping of condensate will be objec-
tionable, insulation of the combustion air pipe may be required.
Use 1/2" thick closed cell foam insulation such as Armaflex™ or
Insultube™ where required.
V /F C
ENT LUE AND OMBUSTION
The vent/flue and combustion air pipes may terminate vertically,
as through a roof, or horizontally, as through an outside wall.
Vertical pipe terminations should be as shown in the following
figure. Refer to Vent/Flue Pipe and Combustion Pipe - Termina-
tion Locations for details concerning location restrictions. The
penetrations through the roof must be sealed tight with proper
flashing such as is used with a plastic plumbing vent.
SCREEN
(OPTIONAL)
OR HIGHEST ANTICIPATED
_____________________________________
COMBUSTION
AIR INTAKE
OR HIGHEST ANTICIPATED
Vertical Terminations (Dual Pipe)
Horizontal terminations should be as shown in the following fig-
ure. Refer to Vent/Flue Pipe and Combustion Pipe - Termination
Location for location restrictions. A 2 3/8" diameter wall penetra-
tion is required for 2" diameter pipe. A 3" diameter hole is required
for a 2 1/2" pipe and a 3 1/2" diameter hole is required for 3"
diameter pipe. The wall penetration should be sealed with caulk-
ing material.
A P T
IR IPE ERMINATIONS
VENT/FLUE
12" MIN.
12" MIN. TO ROOF
SNOW LEVEL
TEE (OPTIONAL)
VENT/FLUE
12" MIN.
SCREEN
(OPTIONAL)
12" MIN. TO ROOF
SNOW LEVEL
10"- 24"
6" MAX
4" MIN
90º OR 45°
ELBOW
SCREEN
(OPTIONAL)
Standard Horizontal Terminations (Dual Pipe)
Vent & Combustion Air Intake Measurements for Stan-
dard Horizontal Terminations (Dual Pipe)
Center to center = 10" min / 24" max.
Vertical separation: 0" - 24"
Vent termination from wall = 8" min / 12" max.
Combustion air intake from wall = 6" max.
Vent and intake clearance to ground
or anticipated snow level = 12" min.
_____________________________________
AIR
INTAKE
SCREEN
(OPTIONAL)
HIGHEST ANTICIPATED
Alternate Horizontal Vent Termination (Dual Pipe)
12" MIN. TO GRADE OR
HIGHEST ANTICIPATED
SNOW LEVEL
90°
ELBOWS
3" - 24"
12" MIN. ABOVE
SNOW LEVEL
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