BIG ASS FANS 2025 Installation Manual page 15

B. Pre-drill angle irons
Drill two Ø7/16" (1.1 cm) holes exactly 5-1/2" (14 cm) apart in the centers of two angle irons.
Measure the distance between the mounting points of the roof structure that the angle irons will span. Measure
the same distance on the angle irons and drill Ø9/16" (1.4 cm) holes through each end of the angle irons. Drill holes
in two angle irons if the span is 8 ft (2.4 m) or less. Drill holes in four angle irons if span is greater than 8 ft (2.4 m).
A
Ø 9/16'' (1.4 cm) Ø 7/16'' (1.1 cm) 1/2 A
5-1/2'' (14 cm)
Distance between roof structure mounting
points
C. Fasten angle irons together (if span is longer than 8 ft [2.4 m])
If the angle iron span is 8 ft (2.4 m) or less, skip this step and proceed to step D.
If the angle iron span is longer than 8 ft (2.4 m), use double angle irons. Locate the center of the angle iron length.
Drill a Ø9/16" (1.4 cm) hole through the center of the vertical wall of the angle iron. Drill a total of four angle irons.
Place two drilled angle irons back to back. Fasten the angle irons together with Grade 8 hardware. Align the angle
irons to each other and tighten the bolts to 25 ft·lb (33.9 N·m) using a torque wrench and 3/4" or 19 mm socket.
Repeat this step for the remaining two angle irons.
c
b
Proceed to step D.
Grade 8 Hardware (Installer-Supplied):
a. (2) 1/2-13 or M12 Bolt
b. (4) 1/2" or M12 Washer
c. (2) 1/2" or M12 Nut
b
a
Side view
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