International comfort products N9MP1 Installation Instructions Manual page 30

4. Install the couplings, nipple and termination elbows as shown
and maintain spacing between vent and combustion air piping
as indicated in Figure 22, Figure 23 and Figure 24.
A metal shield is recommended 18" x 18" (457.2mm x 457.2mm)
min. or 18" (457.2mm) min. diameter around the vent termination
at the exterior wall to protect the house exterior materials from flue
product or condensation (freezing) damage.
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
30
*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
SIDE VIEW
12, (304.8mm) MIN.
25-23-73
Specifications are subject to change without notice
Using Exterior Risers
1. Install elbows and pipe to form riser as shown in Figure 23.
2. Secure vent pipe to wall with galvanized strap or other rust
resistant material to restrain pipe from moving.
3. Insulate pipe with Armaflex or equivalent moisture resistant
closed cell foam insulation or Fiberglass insulation if boxed
in and sealed against moisture.
Vertical Termination
1. Figure 25 shows the proper installation and clearances for
vertical vent termination. The vertical roof termination
should be sealed with a plumbing roof boot or equivalent
flashing. The inlet of the intake pipe and end of the exhaust
vent must be terminated no less than 12" (304.8mm) above
the roof or snow accumulation level, and 12" (304.8mm)
away from a vertical wall or other protrusion.
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.
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, and
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.
A
Figure 29, but the next vent
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