5A. Attach Upper Yoke (To Angle Irons) - BIG ASS FANS Powerfoil 8 Installation Manual

5a. Attach upper yoke (to angle irons)

If the fan will be directly mounted to the angle irons, skip this step and proceed to step 5b.
Secure the upper yoke directly to the angle irons with the Upper Yoke Hardware as shown. The angle irons should be aligned with the
outermost holes of the upper yoke. Consult the diagrams below for distances between the angle irons.
Tighten the bolts to 40 ft·lb (54.2 N·m) using a torque wrench and 3/4" socket. After attaching the upper yoke to the angle irons, tighten
all the bolts securing the angle irons to the roof structure to 40 ft·lb (54.2 N·m).
Upper Yoke Hardware (BAF-Supplied):
a. (4) 1/2"-13 x 2" GR 8 Bolt
b. (8) 1/2'' Flat Washer
c. (4) 1/2-13 Nylock Nut
10-7/8" (27.6cm)
Small Upper Yoke
13 1/4'' (33.7cm) x
Note: Dashed lines represent angle irons in the above illustrations.
The angle irons should be aligned with the outermost holes on the upper yoke. Do not use beam clips on angle irons!
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12'–24' POWERFOIL
Mounting Structure: Bar Joists (cont.)
9 5/8" (24.4cm)
©2012 DELTA T CORP.
® ®
8, 12'–24' POWERFOIL 8PLUS
15-5/8" (39.7cm)
Large Upper Yoke
18''(45.7cm) x
9 5/8"(24.4cm)
a
b
b
c
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Side View
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