Installation Guide

BIG ASS FAN 4900
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4b. Fasten double angle irons to roof structure mounting points
Fasten the angle irons to the roof structure mounting points at each end with customer-supplied Grade 8 hardware as shown. The angle
irons with fan mounting holes should be positioned on the inside, facing each other. If you are mounting the fan directly to the angle
irons, do not tighten the hardware until the main fan unit has been mounted to the angle irons (step 5a). If your fan installation includes
yokes and an extension tube, do not tighten the hardware until the upper yoke has been mounted to the angle irons (step 5b).
Grade 8 Hardware (Customer-Supplied):
a. (8) 1/2-13 Bolt
b. (16) 1/2” Washer
c. (8) 3” Square Washer (BAF-Supplied; see diagram)
d. (8) 1/2-13 Nylock Nut
Mounting Structure: Bar Joists (cont.)
b
a
c
b
d
Square Washer
Thickness:
1/4” (6 mm)
3”
(7.6 cm)
3”
(7.6 cm)
Ø 9/16”
(1.4 cm)