SidewallTermination12"or More
.............................................................................AboveSnowLevelor GradeLevel
MIN. _ "18" Minimum for cold climates
1 (substained below 0 ° F)
EL 25-00-05F
SNOW LEVEL
Horizontal Termination
1,
Cut two holes. 21/2" for 2" pipe, 3" for 21/2" pipe, or 31/2" for
3" pipe. Do NOT make the holes oversized, or it will be nec-
essary to add a sheet metal or plywood plate on the outside
with the correct size hole in it.
2. Check hole sizes by making sure it is smaller than the cou-
plings or elbows that will be installed on the outside. The
couplings or elbows MUST prevent the pipe from being
pushed back through the wall.
3. Extend vent pipe and combustion air pipe through the wall
3/4" to 1" and seal area between pipe and wall.
4. Install the couplings, nipple and termination elbows as
shown and maintain spacing between vent and combustion
air piping as indicated in Figure 21 and Figure 22.
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 ExteriorRisers
1. Install elbows and pipe to form riser as shown in Figure 22.
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
Grade Level
8" *
MIN. "18" Minimum for cold climates
20' (substained below 0° F)
8"
MIN.
Vertical Termination
1. Figure 23 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 23 are maintained. Hori-
zontal section before the termination elbow can be ex-
tended on the inlet air to provide necessary clearance.
Rooftop Termination
A =12"Aboverooforsnowaccumulationlevel
B=8" Min.,20'Maximum,exceptinareaswithextremecoldtemperatures
(sustainedbelow0°% the18"Min.
Vent Termination Shielding
Under certain wind conditions some building materials may be af-
fected by flue products expelled in close proximity to unprotected
surfaces. Sealing or shielding of the exposed surfaces with a cor-
rosion resistant material (such as aluminum sheeting) may be re-
quired 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 24,
Figure 25, Figure 26, Figure 27, Figure 28 and Figure 29, but
the next vent termination must be at least 36" away from first 2 ter-
minations. It is important that vent terminations be made as shown
to avoid recirculation of flue gases.
g_ii_ I c°ncentric Vent and c°mbusti°n-Air Roof Termination
J
12" Min. Grade or_
Snow Level
Combustion
Air
25-00-04F
Dimension "A"is touching or 2"maximumseparation.
44001 102102
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