International comfort products C9MVX Installation Instructions Manual page 31

2. If the vent system is installed in an existing chimney make
sure clearances shown in Figure 25 are maintained.
Horizontal section before the termination elbow can be
extended on the inlet air to provide necessary clearance.
Sidewall Termination with Exterior
Figure 23
Risers to Get Above Snow Level or Grade
Level
8" (203.2mm)* MIN.
20' (6.1m) MAX
GRADE LEVEL
OR
SNOW LEVEL
Recommended Alternate Installation
Figure 24
for Sustained Cold Weather [05 F(-175C) & below for 24
hours or more consecutive hours]
12, (304.8mm) MIN.
EXHAUST
905
FRONT VIEW
Same Joist
Space
440 01 2024 04
*18, (457.2mm) Minimum for
cold climates [sustained 0_F
(-17_C) and below for 24 or
more consecutive hours]
8" (203.2mm)
MIN.
12 " (304.8mm)
MIN.
25-00-04F
OVERHANG
INLET
12, (304.8mm) MIN. Ground
Level OR Snow Level
25-23-73
SIDE VIEW
12, (304.8mm) MIN.
Specifications are subject to change without notice.
Rooftop Termination
Figure 25
B
A
A = 12" (304.8mm) Above roof or snow accumulation level
B = 8" (203.2mm) Min., 20' (6.1m) Maximum, except in areas
with extreme cold temperatures [sustained 0°F(−17°C) and
below for 24 or more consecutive hours], the 18" (457.2mm)
Min.
Vent Termination Shielding
Under certain wind conditions some building materials may be
affected by flue products expelled in close proximity to unprotected
surfaces. Sealing or shielding of the exposed surfaces with a
corrosion resistant material (such as aluminum sheeting) may be
required to prevent staining or deterioration. The protective
material should be attached and sealed (if necessary) to the
building before attaching the vent terminal.
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, and Figure 30 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−Air
Figure 26
Roof Termination
2" (50.8mm) Max
12, (304.8mm)
Min. Grade or
Snow Level
Combustion
Air
A
25−00−06
36" Min
Exhaust
(914.4mm)
OR
36"Min
(914.4mm)
31