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Vent Table - 100,000 BTU/HR Models
Vent Pipe
Length (ft)
5
2
2
10
2
2
20
2
2
30
2
2
40
2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
50
2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
60
2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
70
2.5 2.5 2.5 2.5 2.5 2.5 2.5
80
2.5 2.5 2.5 2.5 2.5
90
2.5 2.5 2.5
Number of 90°
0
1
Elbows
Vent Table - 125,000 BTU/HR Models
Vent Pipe
Length (ft)
5
2.5 2.5 2.5 2.5
10
2.5 2.5 2.5
20
2.5 2.5
30
3
3
40
3
3
50
3
3
60
3
3
Number of 90°
0
1
Elbows
NR = Not Recommended
In the event that the pipe length is in between the lengths listed in
the Vent Table, use the next larger length listed. For example, if a
length of pipe needed to install the furnace is 27 ft, use the
diameter values for the 30 ft row in the tables.
If the vent and air intake pipe are not equal in length and number
of elbows, then determine the minimum pipe diameter for both
the vent and air intake. If the results indicate different diameters,
use the larger of the two for both the vent and air intake.
NOTE: Under no circumstances should the vent and air intake
pipe size be different in diameter. See "Install Vent System" for
the unit model and type of installation.
12
Minimum Pipe Diameter (in.)
2
2
2
2
2
2
2
2
2
2
2
2.5 2.5 2.5
2
2
2
2.5 2.5 2.5 2.5 2.5
2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
3
3
3
3
3
3
3
3
3
2
3
4
5
6
7
Minimum Pipe Diameter (in.)
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
NR NR NR
3
3
3
NR NR NR NR NR
3
NR NR NR NR NR NR NR
NR NR NR NR NR NR NR NR
2
3
4
5
6
7
Determine Vent Pipe Direction
The vent system of the furnace must be self-supporting and must
not apply any weight load to the combustion blower.
2.5 2.5
Vertical Venting
A vertical vent should extend through the roof a minimum of 2 ft
and not be obstructed a minimum of 10 ft in any direction.
Horizontal Venting
The vent terminal location shall comply with Section 7.8 of the
National Fuel Gas Code (ANSI Z223.1) or local requirement,
whichever takes precedence. For informational purposes, the
applicable sections of Section 7.8 are reprinted here:
The venting system shall terminate at least 3 ft (0.9 m) above
any forced air inlet located within 10 ft (3.1 m). This provision
shall not apply to the combustion air inlet of a direct vent
3
appliance or to the separation of the circulating air inlet and
vent discharge of a listed outdoor appliance.
3
3
For direct vent installation of models with an input rating of
50,000 BTUH or less, the vent system shall terminate at least
3
3
9 in. (23 cm) from any opening through which flue gases
could enter a building. For direct vent installation of models
3
3
with an input greater than 50,000 BTUH, the vent system
shall terminate at least 12 in. (30 cm) from any opening
8
9
through which flue gases could enter a building.
The vent terminal and air intake shall terminate at least 12 in.
(30 cm) above grade or maximum expected snow depth.
The vent system, regardless of installation type, shall
terminate a minimum horizontal clearance of 4 ft from electric
meters, gas meters, regulators, and relief equipment.
Vertical Venting
3
3
1
3
3
NR NR
8
9
2
1. Flue pipe screen
2. Flue pipe
3. Storm collars
10 Ft.
Min.
2 Ft.
Min.
Run Pitch = 1/4"
Per Ft. Min.
4. Flashing
(inside flue pipe)
5. Air intake pipe
6. Furnace
6.50" Min.
24" Max.
3
4
5
6
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