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3" MIN
24" MAX
90º
MEDIUM RADIUS
ELBOW
SCREEN
Standard Horizontal Terminations
(Dual Pipe)
24" MAX
AIR
INTAKE
Alternate Horizontal Vent Termination
(Dual Pipe)
3" MIN.
24" MAX.
SUPPORT
STRAPS
COMBUSTION
AIR INTAKE.
90°
SCREEN
MEDIUM
RADIUS
ELBOWS
Standard Horizontal Terminations
Above Anticipated Snow Level (Dual Pipe)
12" MIN
3" MIN
24" MAX
VENT/FLUE
TEE
COMBUSTION
AIR INTAKE
12" MIN
12" MIN
VENT
90°
MEDIUM
RADIUS
ELBOW
24" MAX
3" MIN
SCREEN
12" MIN
12" MIN.
VENT/FLUE
TEE
12" MIN. ABOVE
HIGHEST ANTICIPATED
12" MIN. ABOVE
SNOW LEVEL
HIGHEST ANTICIPATED
SNOW LEVEL
12" Min.
Screen
24" Max.
Alternate Vent Termination
Above Anticipated Snow Level (Dual Pipe)
In a basement installation, the pipes may be run between
the joist spaces. If the pipes must go below the 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 units as with the exhaust
vent and air intake terminations of a single unit.
If more than one direct vent furnace is to be installed
horizontally through a common side wall, maintain the
clearances as in the following figure. Always terminate all
exhaust vent outlets at the same elevation and always
terminate all air intakes at the same elevation.
24" Max.
Air
Intakes
Horizontal Venting Of Multiple Units
CONCENTRIC VENT TERMINATION
Refer to the directions provided with the concentric vent kit
for installation specifications.
20
90°
Medium Radius
Elbow
Vent
24" Max.
3" Min.
Air Intake
12" Min. Above
Highest Anticipated
Snow Level
Vents
90°
Medium
Radius
Elbows
3" Min.
24" Max.
3" Min.
24" Max.
3" Min.
Screen
12" Min.
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