Isis Installation Guide - Big Ass Fans

18 Mounting Structure: Solid Beam
Isis ®
L-brackets are used used to mount the fan to a solid beam. Consult a structural engineer to ensure you have selected
the correct mounting method for your building structure.
WARNING: The fan can weigh up to 120 lbs (54.4 kg). 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 attachment. 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
1. Pre-drill suitable mounting beam
Drill two Ø 7/16” (11 mm) holes in the mounting beam exactly 5-1/2” (14 cm) apart. Consult a structural engineer to determine the exact
location of the mounting holes. Note: The holes should be drilled so that at least 1” (2.5 cm) of clearance will be available between the
lower face of the mounting beam and the top of the upper mount to allow space when tightening the mounting bolts.
2. Determine bracket orientation
Big Ass Fans recommends orienting the L-brackets as shown below depending on the thickness of the mounting structure. The
thickness of the structure cannot exceed 9-1/2” (24 cm).
3-3/4” to 6-3/4” (95 mm to 171 mm) thickness 6-3/4” to 9-1/2” (171 mm to 241 mm) thickness
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