1B. Prepare The Bar Joists; Select Proper Angle Irons - Bigass 4900 Manuel D'installation

1b. Prepare the Bar Joists

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)
6 ft (1.8 m) or less
6 ft to 8 ft (1.8 m to 2.4 m)
8 ft to 12 ft (2.4 m to 3.7 m)
*Two pairs of angle irons needed.
Angle Iron Side View
(see table for dimensions)
Height
Width
2.5" x 2.5" x 0.25" (6.4 cm x 6.4 cm x 0.6 cm)
Thickness
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Minimum Angle Iron Dimensions
(W x H x T)
3" x 3" x 0.25" (7.6 cm x 7.6 cm x 0.6 cm)
3" x 3" x 0.25" (7.6 cm x 7.6 cm x 0.6 cm)
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Number of
Angle Irons
Needed
2
2
4*
11