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Some codes areas allow the use of existing B-type vent systems if the
system is at or above the recommended diameter of the flue.
The flue connection must be made using listed B-type connectors and
the existing system must be code inspected for damage and proper
installation.
Maintain
Listed
Clearance
8'
Position
Firestop
12' Min.
EXAMPLE 1
Lowest
Listed
Discharge
Vent Cap
Opening
8 Ft. Min.
Listed
Gas
Vent
H (Min)
Height
From Roof
126741-01C
VENTING INSTALLATION Continued
Listed
Vent Cap
Maintain
Listed
Clearance
Support Each
Lateral At
Least Every
60°
6 Feet
6'
Position
Firestop
Maintain
Listed
Clearance
Figure 10 - Typical B-Vent Configuration
x
12
Roof Pitch x/12
Listed Clearance
Figure 11 - B-Vent Termination
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It is not recommended that this appliance be common vented with and
existing gas burning appliance. However, if it becomes necessary to
common vent the appliance. The venting system must be sized and
configured in accordance with the common venting guides Appendix
G of the current National Fuel Gas Code NFPA No. 54/ANSI Z223.1.
Note: Before connecting this appliance to an existing vent system or
a common venting system consult with your local architect planner,
or building official.
Listed
Vent Cap
Maintain
Listed
Clearance
45°
12' Min.
Position
Firestop
45°
Maintain
Listed
Clearance
EXAMPLE 2
Roof Pitch
Flat to 6/12
6/12 to 7/12
Over 7/12 to 8/12
Over 8/12 to 9/12
Over 9/12 to 10/12
Over 10/12 to 11/12
Over 11/12 to 12/12
Over 12/12 to 14/12
Over 14/12 to 16/12
Over 16/12 to 18/12
Over 18/12 to 20/12
Over 20/12 to 21/12
Listed
Vent Cap
Maintain
Listed
Clearance
45°
10'
12' Min.
Maintain
Listed
Clearance
EXAMPLE 3
H (Min.)
1.0 ft (0.3 m)
1.25 ft (0.38 m)
1.5 ft (0.46 m)
2.0 ft (0.61 m)
2.5 ft (0.76 m)
3.25 ft (0.99 m)
4.0 ft (1.22 m)
5.0 ft (1.52 m)
6.0 ft (1.83 m)
7.0 ft (2.13 m)
7.5 ft (2.27 m)
8.0 ft (2.44 m)
9
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