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506305-01Page 8 of 36 Issue 0938
Figure 4
Vent Tables *
(numbers in inches unless specified otherwise)
Minimum Pipe Diameter
45,000 – 75,000 BTU/HR Models
NR = Not Recommended
* 2” not recommended at altitude above 4,000 feet
3” required for altitude above 5,000 feet
Minimum Pipe Diameter
112,000 – 125,000 BTU/HR Models
Minimum Pipe Diameter
90,000 – 100,000 BTU/HR Models
0123456789
222222222
2222222
2
3333
33333
Vent Pipe
Length
(ft.)
Number of 90° Elbows
5
10
20
30
40
50
60
70
80
90
1.5
1.5
1.5
22222
2
22
2.5
2
222222
2
2
2.5 2.5
2.5
2.5
2.5
2.5
2.5 2.5
22 2
2
2
32.5 2.5
2.5 2.5 2.5 2.5
2.5
3
3
3
2.5
2
2
2.5 2.5
2.5 2.5
2.5
2.52.52.5
2.52.5
2.5
2.5
2.5
2.52.5
3
3
33
3
NR
NR NR
NR
NR
NR
0123456789
222
2
22
222 333
3
33333
3333
33
Vent Pipe
Length
(ft.)
Number of 90° Elbows
5
10
20
30
40
50
60
70
80
90
3
3
33
3
3 3
3
3
3
3
3 3
3
33
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 2.5 2.5
2.5 2.5
2.5
2.5
2.5
2.5
2.5
NR
NR
NR
2
NR
2
2
2
2
22
22222
2
2
NR NR NR
NR
NR
NR NR
NR
NR
NR
NRNR
NR
NR NR NR
NR
NR
NR
NR
NR
0123456789
.
3
33
Vent Pipe
Length
(ft.)
Number of 90° Elbows
5
10
20
30
40
50
60
NR
2.5
3
3
33
3
3
3
NR
NR
NR
NR
NR
NR
NR NR
NR
NR
NR
NR
NR
NRNR
NR
NR
NR
NR NR NR
NR
NR
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
2.5
2.5
2.5
2.5
2.52.52.5
2.5
2.5
2.5
2.5 2.5
2.5
2.52.5
2.52.52.5
2.5
2.5
2.52.5