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VII. Venting (continued)
G. General Termination
1. Use only listed vent/combustion air terminals.
2. Follow the termination configurations shown
in Table 13, and see Table 16 for acceptable
termination components.
3. Maintain correct clearance and orientation
between vent and combustion air terminals.
a. The required spacing between vent and
combustion air terminals is to prevent flue gas
recirculation. Recirculation of flue gas products
into the combustion air supply can cause damage
to property or the appliance.
Table 13: Recommended Venting Configurations and Material Options
Vent & Intake
Materials
Two Pipe
Stainless Steel vent
Galvanized Steel or
PVC intake
Two Pipe
Polypropylene vent
Galvanized Steel or
PVC intake
Two Pipe
CPVC vent
Galvanized Steel or
PVC intake
SS, PP,
or CPVC vent
Room air intake
NOTICE
NOTICE
20
Vent
Penetration
Option
Through Structure
Intake
Horizontal Sidewall
1
Vent
Horizontal Sidewall
Intake
Horizontal Sidewall
2
Vent
Vertical Roof
Intake
Vertical Roof
3
Vent
Vertical Roof
Intake
Horizontal Sidewall
4
Vent
Horizontal Sidewall
Intake
Horizontal Sidewall
5
Vent
Vertical Roof
Intake
Vertical Roof
6
Vent
Vertical Roof
Intake
Horizontal Sidewall
7
Vent
Horizontal Sidewall
Intake
Horizontal Sidewall
8
Vent
Vertical Roof
Intake
Vertical Roof
9
Vent
Vertical Roof
10
Vent
Horizontal Sidewall
11
Vent
Vertical Roof
1. It is recommended to use tees for both intake and vent terminations in extra windy
locations.
2. All terminations shall have bird screens.
3. All non-metallic venting exposed to sunlight shall be UV resistant.
b. When installed on the same wall, locate
vent terminal 4 vent pipe diameters above
the combustion air terminal. The snorkle
configuration can be used when penetrations are
at the same hieght.
4. Locate bottom of vent and combustion air terminals
at least 12 in. (300 mm) [18 in. (460 mm) in Canada]
above the normal snow line and at least 12 in. (300
mm) above grade level.
5. Do not install vent terminal directly above windows
or doors.
6. Locate bottom of vent terminal at least 3 ft. (900
mm) above any forced air inlet located within 10
ft. (3.0 m).
Termination
Parts Table
90° elbow
Tee or 45° elbow
90° elbow
Tee or straight
Tee or 2 90° elbows
Tee or straight
90° elbow
Tee or 45° elbow
90° elbow
Tee or straight
Tee or 2 90° elbows
Tee or straight
90° elbow
Tee or 45° elbow
90° elbow
Tee or straight
Tee or 2 90° elbows
Tee or straight
Tee or 45° Elbow
Tee or straight
Reference
Figure
Figure 9
Table 10
-
Figure 10
Figure 11
Figure 9
Table 11
-
Figure 10
Figure 11
Figure 9
-
-
Figure 10
Figure 11
Table 10
-
Table 11
AMP 400-1000L I&O Manual
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