Roof Slope=
Rise/Run
Fan Diameter
Run=12"
Rise=?"
NO OBSTRUCTIONS IN THIS AREA
(15% OF FAN DIAMETER)
Total fan height
approximately19.5"
The extension lengths below are minimum recomendations only, based soley on roof
pitch and fan diameter. Other consideration must be evaluated when determining
extension requirements, such as placement of lights, sprinklers systems, HVAV systems
and so on. In addition, OSHA requirements state that fan blade must be a minimum of 10
feet (3.05 Meters) above the floor. Contact our sales department for assistance with fan
placment and extension selection.
Fan Clearance And Extension Guide
Slope
2/12
4/12
6/12
8/12
10/12
Roof Anlgle
9.5
18.4
26.6
33.7
39.8
Fan
Diameter
Recomended Length
Clearance
Zone Radius
8
1 ft
1 ft
2 ft
3 ft
4 ft
14.5"
10
1 ft
2 ft
3 ft
4 ft
5 ft
18"
12
2 ft
3 ft
4 ft
5 ft
6 ft
32.5"
pg 4
