Select Proper Angle Irons - BIG ASS FANS 4900 Installation Manual

Big Ass Fans can only be hung from an I-beam or bar joists. See page 15 for I-beam mounting instructions (optional).
Consult a structural engineer for installation methods not covered in this manual.
WARNING: The fan should not be installed unless the structure on which the fan is to be mounted is of sound
construction, undamaged, and capable of supporting the loads of the fan and its method of mounting. A structural
engineer should verify that the structure is adequate prior to fan installation. Verifying the stability of the mounting
structure is the sole responsibility of the customer and/or end user, and Big Ass Fans hereby expressly disclaims any
liability arising therefrom, or arising from the use of any materials or hardware other than those supplied by Big Ass Fans
WARNING: Never use beam clips when mounting fans to angle irons! Beam clips are intended for I-beam installations.
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.

1. 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
Mounting Structure: Bar Joists
Minimum angle iron dimensions
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BIG ASS FAN 4900
Number of angle
irons needed
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Angle Iron Side View
2
2
Height
4*
9
Thickness