Specifications

Straight Vertical, Top or Rear Vent, Roof mounted
power vent.
 Multi-Elbow, Top or Rear Vent, Roof mounted power vent.

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This section applies to installations where the most efcient vent run
is through the roof. Refer to Appendix A - Power Vent locations,
to ensure the planned Power vent location is acceptable. Refer to
the table below for vent run requirements.
Section 3-2: Installing a Roof Mounted Vent System
Vent Conguration Refer to Figure
Maximum Vent Run
(Horizontal + Vertical)
Maximum Elbows†
Straight Vertical Top or Rear Vent Figure 10
100 Feet
Six 90°
or
equivalent †
Multi-Elbow Top or Rear Vent Figure 10a
Multi-Elbow with 6' downward vent
run Top or Rear Vent
Figure 10b
70 Feet**
† One 90° elbow is equal to two 45° elbows.
** For every additional 1 foot downward vent run subtract 10 feet from the maximum vent run.