BIG ASS FANS Isis, Installation Manual, Page: 18 / 60

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10
Mounting Method: Angle Irons (cont.)
3. Secure angle irons (if span is longer than 8 ft)
If the angle iron span is 8 ft (2.4 m) or less, proceed to
step 4a on the following page.
If the angle iron span is longer than 8 ft (2.4 m), it is necessary to
use double angle irons.
Locate the center of the angle iron length. Drill Ø 9/16” (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 customer-supplied Grade 8 hardware.
Align the angle irons to each other and tighten the bolts to
25 ft·lb
(33.9 N·m)
using a 3/4” socket with torque wrench.
Repeat step for remaining two angle irons.
Proceed to step 4b.
Angle Iron Hardware (Customer-Supplied):
a. (2) 1/2-13 Bolt
b. (4) 1/2” Washer
c. (2) 1/2” Nut
Side View
a
b
b
c
2. Pre-drill angle irons
Drill two Ø 9/16”(1.4 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 Ø 9/16” (1.4 cm) holes through each end of the angle irons. Drill holes in two angle irons if 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).
Ø 9/16" (1.4 cm)
distance between roof
structure mounting points
5 1/2” (14 cm)
A
1/2 A
Ø 9/16" (1.4 cm)