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Dimension 'H' obtained
from table below
Figure 72: Height of Vertical Termination; Reference Table 9
NOTES:
1. If an offset is necessary in the attic to avoid obstructions, it is important to support the vent pipe
every 3' (914 mm) using wall straps to avoid excessive stress on the elbows.
2. Use 45° degree elbows instead of 90° degree elbows when ever possible. The 45° degree elbow
offers less restriction to the flow of flue gases and intake air.
Plumber's tape
connected to
wal strap
Wall strap
Figure 73: Multi-Story Vent Pipe Installation
48
Initial Installation
QUALIFIED INSTALLERS ONLY
45° elbows (x2)
Table 9: Minimum 'H' for Figure 72.
Roof Pitch
Flat to 7/12
Over 7/12 to 8/12
Over 8/12 to 9/12
H
Over 9/12 to 10/12
Over 10/12 to 11/12
Over 11/12 to 12/12
Over 12/12 to 14/12
Over 14/12 to 16/12
Over 16/12 to 18/12
Over 18/12 to 20/12
Over 20/12 to 21/12
Figure 74: Use of Wall Straps.
Minimum Height (H)
Feet
Meters
1
0.3
1.5
0.46
2
0.61
2.5
0.76
3.25
0.99
4
1.22
5
1.52
6
1.83
7
2.13
7.5
2.29
8
2.44
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