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INSTALLATION
Figure 5.1 - Typical Duct & Airflow Installation
A
Turning
Vanes
3" Min.
SIDE
3" Max.
A
B
12"
Min.
D
B
SIDE
A
Baffle
G
SIDE
No Air
VENTING
WARNING
1. Gas fired heating equipment must be vented - do not
operate unvented.
2. a. Models with Digit 3=G have a built-in draft diverter - additional
external diverters are not required or permitted.
b. Models with Digit 3=P have a built-in power exhauster -
additional external power exhausters are not required or
permitted.
3. If you are replacing an existing heater, it may be necessary to
resize the venting systems. Improperly sized venting systems
can result in vent gas leakage or the formation of condensate.
Refer to the National Fuel Gas Code ANSI Z223.1 or CSA
B149.1 latest edition. Failure to follow these instructions can
result in injury or death.
4. For Models with Digit 3=G, gas-fired heating equipment which
has been improperly vented, or which experiences a blocked
vent condition may have flue gases accidentally spilled into the
heated space. See page 22 for specific information about the
blocked vent safety switch supplied on the unit.
5. For Models with Digit 3=P, under no circumstances should two
sections of double wall vent pipe be joined together within one
horizontal vent system due to the inability to verify complete
seal of inner pipes.
General Venting Instructions
1. Installation of venting must conform with local building codes,
or in the absence of local codes, with the National Fuel Gas
Code, ANSI Z223.1 (NFPA 54) - Latest Edition. In Canada,
installation must be in accordance with CAN/CGA-B149.1 for
natural gas units and CAN/CGA-B149.2 for propane units.
2. To determine the Venting Category of the unit being installed,
refer to Table 5.1.
Turning
Vanes
12"
Min.
Air
Baffle
Turning
Vanes
3" Max.
24"
Min.
3" Max.
B
Air
3" Min.
Baffle
B
12"
Min.
SIDE
A
Baffle
24"
Min.
E
Turning
12"
Min.
Vanes
3" Max.
B
SIDE
A
3" Min.
Turning
Vanes
15° Max.
Baffle
H
SIDE
No Air
Table 5.1 - Venting Category Determination
Model
Venting
Digit 3
Category
G or P
P
III
j Vent is negative pressure, non-condensing. Follow standard venting
requirements.
k Vent is positive pressure, non-condensing. Vent must be gastight.
3. For units vented as Category I, refer to Table 5.2 for vent
sizing. Vent sizing for units vented as Category III are covered
in a later section on page 7. Do not use a vent pipe smaller
than the size of the outlet or vent transition of the appliance.
The pipe should be suitable corrosion resistant material.
Follow the National Fuel Gas Code for minimum thickness
and composition of vent material. The minimum thickness for
connectors varies depending on the pipe diameter.
Table 5.2 - Category I Minimum Vent Pipe Diameter
Model
Size
75
100-125
150-175
200-225
250
300-400
j Requires a 4" to 5" adapter for the larger vent pipe diameter.
5-564.4
12"
B
Min.
TOP
A
Dimensions "B" should never be less than
12"
Min.
TOP
Turning
Vanes
No Air
Vent Configuration
I
Vertically vented units only.
j
Horizontally vented units only.
k
Minimum Vent Pipe Diameter
Model Digit 3=G
Model Digit 3=P
5"
6"
7"
7"
8"
10"
C
15° Max.
/
of "A".
1
2
F
Turning
Vanes
15° Max.
J
TOP
4"
4"
5" j
6"
6"
6"
5
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