Multi Vent Termination Clearances
When two (2) or more furnaces are vented near each other, each
furnace must be individually vented.
Two (2) vent terminations may be installed as shown in Figure 23,
Figure 24, Figure 25, Figure 26, Figure 27 and Figure 28, but
the next vent termination must be at least 36" away from first 2ter-
minations. Itis important that vent terminations be made as shown
to avoid recirculation of flue gases.

I c°ncentric vent andc°mbusti°n-AirRoof Termination

12"Min. Gradeori
SnowLevel
Combustion
Air
Dimension "A" is touching or 2" maximum separation.

Concentric Vent and Combustion-

Air Sidewall Termination

Exhaust
Vent 25-22-02d
Dimension "A" is touching or 2" maximum separation.

Sidewall Inlet Vent and Exhaust-

Air Termination

18"Min.for
ColdClimates
(Sustained
Below0oF
12" Min. Grade or
Snow Level
FF_iDiDimension "A" is touchin9 or 2" maximum separation.

Sidewall Inlet Vent and Exhaust-Air

Termination with Exterior Risers

18"Min. forCold Climates_
(SustainedBelow0° F) 8" Min.
Gradeor
SnowLevel
Dimension "A" is touchin9 or 2" maximum separation.
iiiil
Rooftop Inlet Vent and Exhaust-
Air Termination
18"Min.forColdClimates _ \ _-
(SustainedBelow0°F) 8"Min.
20'Max.
12" Min.
Level
/
Exhaust
25-22-43

Recommended Alternate

Installation for Sustained

Cold Weather (-O ° F & below)

OVERHANG
EXHAUST12"MIN.
IN ET
Level
ORSnow Level
FRONT VIEW
Same Joist
Space
SIDE VIEW
25-23-73
44001 1020 04