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117437-01D10
In each case the offsets must be supported
-
must terminate vertically into a listed type vent
thimble. At all points the listed clearances
must be maintained.
Vent terminations must be located in accor-
dance with height and proximity rules of NFPA
No. 54 or CAN/CSA B149. These rules apply
to vents at 12" diameter or less and require a
minimum height in accordance with the roof
pitch and a minimum of 8 foot distance from a
vertical wall or obstruction (see Figure 11).
-
for use with B-type vent must be used. Check
with your local codes before venting through
a side wall.
Some codes areas allow the use of existing B-
type vent systems if the system is at or above
B-type connectors and the existing system
must be code inspected for damage and proper
installation.
It is not recommended that this appliance be
common vented with and existing gas burning
to common vent the appliance. The venting
-
cordance with the common venting guides
Appendix G of the current National Fuel
Gas Code NFPA No. 54/ANSI Z223.1 and in
Canada with CAN/CSA B149.
Note: Before connecting this appliance to an
existing vent system or a common venting
system consult with your local architect plan-
ner, or building ofcial.
VENTING INSTALLATION
Continued
Lowest
Discharge
Opening
Listed
Vent Cap
8 Ft. Min.
Roof Pitch x/12
Listed Clearance
12
x
Listed
Gas
Vent
H (Min)
Height
From Roof
Figure 11 - B-Vent Termination
Roof Pitch H (Min.)
Flat to 6/12 1.0 ft (0.3 m)
6/12 to 7/12 1.25 ft (0.38 m)
Over 7/12 to 8/12 1.5 ft (0.46 m)
Over 8/12 to 9/12 2.0 ft (0.61 m)
Over 9/12 to 10/12 2.5 ft (0.76 m)
Over 10/12 to 11/12 3.25 ft (0.99 m)
Over 11/12 to 12/12 4.0 ft (1.22 m)
Over 12/12 to 14/12 5.0 ft (1.52 m)
Over 14/12 to 16/12 6.0 ft (1.83 m)
Over 16/12 to 18/12 7.0 ft (2.13 m)
Over 18/12 to 20/12 7.5 ft (2.27 m)
Over 20/12 to 21/12 8.0 ft (2.44 m)
Figure 10 - Typical B-Vent Conguration
Maintain
Listed
Clearance
Maintain
Listed
Clearance
12' Min.
12' Min.
45°
45
6'
8'
12' Min.
60
45
Position
Firestop
Position
Firestop
Position
Firestop
Listed
Vent Cap
Listed
Vent Cap
Listed
Vent Cap
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Maintain
Listed
Clearance
Support Each
Lateral At
Least Every
6 Feet
Maintain
Listed
Clearance
10'
EXAMPLE 3EXAMPLE 2
EXAMPLE 1