Lenoxx G1D91BT, Installation Instructions Manual, Page: 8 / 36

506305-01 Page 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
0 1 2 3 4 5 6 7 8 9
2 2 2 2 2 2 2 2 2
2 2 2
2 2
2 2
2
3 3 3 3
3 3 3 3 3
Vent Pipe
Length
(ft.)
Number of 90° Elbows
5
10
20
30
40
50
60
70
80
90
1.5 1.5
1.5 2 2 2 2 2 2 2 2
2.5
2
2 2 2 2 2 2
2
2
2.5 2.5 2.5
2.5 2.5 2.5 2.5 2.5 2 2 2 2 2
3 2.5 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
2.5 2.5 2.5 2.5 2.5
2.5
2.5
2.5
2.5 2.5
3 3 3 3 3
NR
NR NR
NR NR NR
0 1 2 3 4 5 6 7 8 9
2 2 2 2 2 2
2 2 2 3 3 3
3
3 3 3 3 3
3 3 3 3
3 3
Vent Pipe
Length
(ft.)
Number of 90° Elbows
5
10
20
30
40
50
60
70
80
90
3
3
3 3
3
3 3 3 3
3
3
3 3 3 3 3
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
2 2
2 2 2 2 2
2
2
NR NR NR
NR NR NR NR NR
NR
NR NR NR NR
NR NR NR NR NR NR NR
NR
0 1 2 3 4 5 6 7 8 9
.
3
3 3
Vent Pipe
Length
(ft.)
Number of 90° Elbows
5
10
20
30
40
50
60
NR
2.5
3
3
3 3
3
3 3
NR
NR
NR
NR
NR NR NR NR NR NR NR NR
NR NR NR 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
2.5 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