21
Standard Horizontal Vent Terminations (Dual Pipe)
Alternate Horizontal Vent Terminations (Dual Pipe)
Standard Horizontal Terminations (Dual Pipe)—Above
Highest Anticipated Snow Level
Alternate Horizontal Terminations (Dual Pipe)—Above
Highest Anticipated Snow Level
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In a basement installation, the vent/flue pipe can be run
between joist spaces.
NOTE: If the vent pipe must go below a joist and then up into
the last joist space to penetrate the header, two 45° elbows
should be used to reach the header rather than two 90°
elbows.
Vent/Intake Terminations for Installation of
Multiple Direct Vent Furnaces
If more than one direct vent furnace is to be installed vertically
through a common roof top, maintain the same minimum
clearances between the exhaust vent and air intake terminations
of adjacent furnaces as with the exhaust vent and air intake
terminations of a single furnace.
If more than one direct vent furnace is to be installed horizontally
through a common side wall, maintain the clearances as shown
in “Horizontal Venting of Multiple Furnaces” illustration. Always
terminate all exhaust vent outlets at the same elevation and
always terminate all air intakes at the same elevation.
Horizontal Venting of Multiple Furnaces
A. 24" (61 cm) maximum, 3"
(7.6 cm) minimum
B. 12" (30.5 cm) minimum from
wall
C. Vent/flue tee
D. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
E. Combustion air intake
F. Screen (optional)
G. 45º or 90º medium radius elbow
A. 90º medium radius elbow
B. Vent/flue pipe
C. 12" (30.5 cm) minimum
from wall
D. Screen (optional)
E. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
F. Combustion air intake
G. 24" (61 cm) maximum, 3" (7.6 cm)
minimum
H. 24" (61 cm) maximum radius
A. Support straps
B. 24" (61 cm) maximum, 3"
(7.6 cm) minimum
C. 12" (30.5 cm) minimum from wall
D. Vent/flue tee
E. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
F. Screen (optional)
G. 45º or 90º medium radius elbow
H. Combustion air intake
F
C
E
A
G
D
D
B
A
A
B
D
F
C
H
G
E
H
G
F
D
A
A
C
B
E
E
A. 45º or 90º medium radius
elbow
B. Flue/vent pipe
C. 24" (61 cm) maximum, 3"
(7.6 cm)
D. Combustion air intake
E. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
F. 24" (61 cm) maximum radius
G. Screen (optional)
A. 90º medium radius elbows
B. Flue/vent pipes
C. 12" (30.5 cm) minimum
D. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
E. Screen (optional)
F. 24" (61 cm) maximum, 3"
(7.6 cm) minimum
G. 3" (7.6 cm) minimum
H. Combustion air intakes
A
B
D
G
C
E
F
A
B
H
D
C
F
F
G
E
B