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3.
Extend vent pipe and combustion air pipe through the wall
3
/
" to 1" and seal area between pipe and wall.
4
4.
Install the couplings, nipple and termination elbows as
shown and maintain spacing between vent and combustion
air piping as indicated in Figure 22 and Figure 23.
A metal shield is recommended 18" x 18" min. or 18" min.
diameter around the vent termination at the exterior wall to protect
the house exterior materials from flue product or condensation
(freezing) damage.
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.
Sidewall Termination with Exterior
Risers to Get Above Snow Level or
Figure 23
Grade Level
8" *
MIN.
20'
MAX
INLET
EXHAUST
GRADE LEVEL
OR
SNOW LEVEL
Vertical Termination
1.
Figure 24 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" above the roof or
snow accumulation level, and 12" 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 24 are maintained.
Horizontal section before the termination elbow can be
extended on the inlet air to provide necessary clearance.
440 01 1024 01
*18" Minimum for cold climates
[sustained temperatures 0° F (- 18° C)
and below for 24 or more consecutive
hours]
8"
MIN.
12 "
MIN.
25--00--04F
Specifications are subject to change without notice
Rooftop Termination
Figure 24
B
A
A = 12" Above roof or snow accumulation level
B = 8" Min., 20' Maximum, except in areas with extreme cold temperatures (sustained
temperatures 0°F and below for 24 or more consecutive hours), then 18" 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 25,
Figure 26, Figure 27, Figure 28, Figure 29 and Figure 30, but
the next vent termination must be at least 36" away from first 2
terminations. It is important that vent terminations be made as
shown to avoid recirculation of flue gases.
Concentric Vent and Combustion- -
Figure 25
Air Roof Termination
2"
2" Max
12" Min. Grade
or Snow Level
Combustion
Air
A
Exhaust
36" Min
OR
36" Min
29
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