For quick reference, Tables 6 and 7 give the maximum allowable length of straight pipe
based on the total number of elbows per pipe run.
Table 6: Maximum Pipe Lengths Quick Reference (Two-Pipe Terminations)
Table 7: Maximum Pipe Lengths Quick Reference (Concentric Termination)
Page 12
Model(s)
Pipe Ø (in)
# of 90° Elbows per
pipe run
(including termination fittings)
Maximum Equivalent Pipe
Length (per pipe run)
Air Intake
Ft (m)
Vent
Ft (m)
75-76SKG,
100-76SKG
3
0
55 (16.76)
55 (16.76)
3
1
50 (15.24)
50 (15.24)
3
2
45 (13.72)
45 (13.72)
3
3
40 (12.19)
40 (12.19)
3
4
35 (10.67)
35 (10.67)
3
5
30 (9.14)
30 (9.14)
3
6
25 (7.62)
25 (7.62)
4
0
85 (25.91)
85 (25.91)
4
1
80 (24.38)
80 (24.38)
4
2
75 (22.86)
75 (22.86)
4
3
70 (21.34)
70 (21.34)
4
4
65 (19.81)
65 (19.81)
4
5
60 (18.29)
60 (18.29)
4
6
55 (16.76)
55 (16.76)
Model(s)
Pipe Ø (in)
# of 90° Elbows per
pipe run
(including termination fittings)
Maximum Equivalent Pipe
Length (per pipe run)
Air Intake
Ft (m)
Vent
Ft (m)
75-76SKG,
100-76SKG
3
0
45 (13.72)
45 (13.72)
3
1
40 (12.19)
40 (12.19)
3
2
35 (10.67)
35 (10.67)
3
3
30 (9.14)
30 (9.14)
3
4
25 (7.62)
25 (7.62)
3
5
20 (6.10)
20 (6.10)
3
6
15 (4.57)
15 (4.57)
4
0
75 (22.86)
75 (22.86)
4
1
70 (21.34)
70 (21.34)
4
2
65 (19.81)
65 (19.81)
4
3
60 (18.29)
60 (18.29)
4
4
55 (16.76)
55 (16.76)
4
5
50 (15.24)
50 (15.24)
4
6
45 (13.72)
45 (13.72)
SECTION IV: INSTALLATION (cont .)
VENT & COMBUSTION AIR INTAKE (cont.)
