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load. Consult available guides for proper sizing of the
manifold and the chimney. At no time should the area
of the common vent be less than the area of the
largest heater exhaust outlet.
WARNING: Vent connectors serving appliances
vented by natural draft shall not be connected into
any portion of mechanical draft systems operating
under a positive pressure.
CAUTION: Vent connectors for natural draft
venting systems must be Type B or better.
Common venting systems may be too large once an
existing unit is removed. At the time of removal of an
existing appliance, the following steps must be fol-
lowed with each appliance remaining connected to the
common venting system placed in operation, while the
other appliances remaining connected to the common
venting system are not in operation.
Certified
Model
Venting
No.
Material
399B
499B
649B
749B
899B
Category I
989B
(Type B
1259B
Equivalent)
1529B
1799B
1999B
2069B
2339B
* Vent lengths are based on a lateral length of 2 ft. Refer to the latest edition of the NFGC for further details.
When vertical height exceeds 25 ft, consult factory prior to installation.
** Subtract 10 ft per elbow. Max. 3 elbows.
Maximum combustion air duct length terminated at 100 equivalent ft.
Vertical Venting
Vent
Height*
Size
Min.
Max.
6"
8"
10"
5'
25'
12"
14"
16"
Table L: Category I Vertical Venting
1. Seal any unused opening in the common venting
system.
2. Visually inspect the venting system for proper size
and horizontal pitch and verify there is no block-
age, restriction, leakage, corrosion or other unsafe
condition.
3. Insofar as is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the com-
mon venting system are located and other spaces
of the building. Turn on clothes dryers and any ap-
pliance not connected to the common vent
system. Turn on any exhaust fans, such as range
hoods and bathroom exhausts, at maximum
Combustion
Air
Intake Pipe
6"
Material
100'
75'
40'
Galvanized
Steel,
PVC, ABS,
CPVC
29
Air Inlet Max. Length**
8"
10"
100'
75'
40'
12"
100'
75'
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