International comfort products C9MPX Installation Instructions Manual page 31

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 26,
Figure 27, Figure 28, Figure 29, Figure 30 and Figure 24, but
the next vent termination must be at least 36" (914.4mm) away
from first two terminations. It is important that vent terminations be
made as shown to avoid recirculation of flue gases.
Concentric Vent and Combustion−
Figure 26
Air Roof Termination
2" (50.8mm) Max
12, (304.8mm)
Min. Grade or
Snow Level
Combustion
Air
Concentric Vent and Combustion−
Figure 27
Air Sidewall Termination
Combustion Air
Exhaust
Vent
Dimension "A" is touching or 2" (503.8mm) maximum separation.
440 01 1051 02
36" Min
Exhaust
(914.4mm)
OR
36"Min
(914.4mm)
1, (25.4mm)
Maximum
Vent
"A"
25-22-02d
Specifications are subject to change without notice.
Sidewall Inlet Vent and Exhaust−
Figure 28
Air Termination
Exhaust
"A"
Inlet
12, (304.8mm) Min.
Grade or Snow Level
Dimension "A" is touching or 2" (50.8mm) maximum separation.
Sidewall Inlet Vent and Exhaust−Air
Figure 29
Termination with Exterior Risers
8, (203.2mm) Min.
204 (6.1m) Max.
Exhaust
"A"
Dimension "A" is touching or 2" (503.8mm) maximum separation.
Rooftop Inlet Vent and Exhaust−
Figure 30
Air Termination
8, (203.2mm) Min.
204 (6.1m) Max.
Inlet
12, (304.8mm)
Min. Grade or
Snow Level
"A"
8, (203.2mm)
Min.
8, (203.2mm) Min.
204 (6.1m) Max.
18, (457.2mm) Min. for Cold Climates
[Sustained 05F(-175C) and below for
24 hours or more consecutive hours]
8, (203.2mm) Min.
12, (457.2mm)
Min. Grade or
Inlet
Snow Level
"A"
18, (457.2mm) Min. for Cold Climates
[Sustained 05F(-175C) and below for
24 hours or more consecutive hours]
Exhaust
18, (457.2mm) Min. for Cold Climates
[Sustained 05F(-175C) and below for
25-22-43
24 hours or more consecutive hours]
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