Sidewall Termination with Exterior
Risers to Get Above Snow Level or
Grade Level
j. "18" Minimumfor cold ciimates
8"* _ (substainedbelow 0° F)
S MIN. /
20' /_W
MAX /
SNOW LEVEL 2_-00-04F
Vertical Termination
1. Figure 19 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 19 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" Above roof or snow accumulation level
B = 8" Min., 20' Maximum, except in areas with extreme
cold temperatures (sustained below 0°F), the 18" Min.
VentTermination 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 be-
fore attaching the vent terminal.
MultiVent 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 20, Figure 21, Figure 22, Figure 23, Figure 24 and
Figure 25, 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 recalculation of flue gases.
Concentric Vent and Combustion-
Air Roof Termination
/
12"
or Snow Level
Combustion
Air
Dimension "A" is touching or 2" maximum separation.
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Concentric Vent and Combustion-
Air Sidewall Termination
Exhaust
Vent 25-22-02d
Dimension 'W' is touching or 2" maximum separation.
Sidewall Inlet Vent and Exhaust-
Air Termination
8" Min,
18" Min, for
Cold Climates
(Sustained Below 0° F)
12" Min.Grade //
or Snow Level
__D mension "A" is touchin_ or 2" maximum separation.
440 01 101004 [_
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