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1b. Prepare the Angle Irons
CAUTION: Do not install the fan from a single purlin, truss, or bar joist.
CAUTION: Unsupported angle iron spans should not exceed 12 ft (3.7 m).
CAUTION: The angle irons must be fastened to the roof structure at each end.
If you are mounting your fan to an I-Beam, see the previous page. Consult a structural engineer for installation
methods not covered in this manual.
A. Select proper angle irons
Follow the table below when selecting angle irons for fan installation. Note: Angle irons and angle iron hardware
are not included with the fan.
Angle iron span
(between mounting points)
Minimum Angle Iron dimensions
(W x H x T)
Number of angle
irons needed
6 ft (1.8 m) or less 2.5” (6.4 cm) x 2.5” (6.4 cm) x 0.25” (0.6 cm) 2
6 ft to 8 ft (1.8 m to 2.4 m) 3” (7.6 cm) x 3” (7.6 cm) x 0.25” (0.6 cm) 2
8 ft to 12 ft (2.4 m to 3.7 m) 3” (7.6 cm) x 3” (7.6 cm) x 0.25” (0.6 cm) 4*
*Two pairs of angle irons needed.
6 ft (1.8 m) or less
over 6–8 ft (1.8–2.4 m)
over 8–12 ft (2.4 m–3.7 m)
Angle Iron Side View
(see table for dimensions)
Width
Height
Thickness
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