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Section 3-2: Installing a Roof Mounted Vent System
This section applies to installations where the most efficient vent run is
through the roof. Refer to Appendix A - Power Vent locations, to ensure
the planned Power vent location is acceptable.
Selection of components and details of venting lay out should
adhere to the following guidelines:
Ensure the maximum vent run does not exceed 80'
Ensure the number of 90° elbows does not exceed 6
Ensure the number of 45° elbows does not exceed 12
Straight Venting Layout
R320ST
R420ST
R520ST
R620ST
Figure 6. Straight Vertical, Top Vent, Roof mounted power vent.
Multi-Elbow Installations
MAX V1+H1+
V2+H2+V3
R320ST, R420ST
80'
R520ST, R620ST
100'
Figure 6.b Multi-Elbow, Top Vent, Roof mounted power vent.
12
V (Maximum
Max. #
Length)
Elbows
80'
N/A
120'
N/A
V3
Max. #
Elbows
H2
6
6
V2
H1
V1
Downward Vertical Venting
MAX V1+H1+
D+H2+V3
R320ST, R420ST
40'
R520ST, R620ST
40'
Elbow 1
Elbow 2
V1
V1
Elbow 1
Elbow 1
Figure 6.c Multi-Elbow with downward vent run, Top or Rear Vent, Roof mounted power vent.
Installation
Max. #
Elbows
6
6
Elbow 2
Elbow 3
H1
H1
D = 6' foot
D = 6' Max
MAX
Elbow
Elbow 4
Elbow 4
Elbow 3
H2
H2
XG0231 - 061120
V3
V3
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