Attach Airfoils (To Main Fan Unit) - BIG ASS FANS Isis Installation Manual

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3. Attach airfoils (to main fan unit)

After the fan is completely assembled and securely hanging from the mounting structure, peel off the protective plastic
from the bottom of the hub.
WARNING: Disconnect power to fan before installing airfoils.
Attach the 10 airfoil retainers using the Airfoil Hardware. Moving clockwise around the fan hub, position the airfoil retainers as shown.
Hole A of the retainer should be positioned over top of Hole B. Do not tighten bolts until all airfoil retainers have been attached!
Tighten the bolts along the outside perimeter to 29 ft·lb (39.3 N·m) using a torque wrench and a 1/2" socket. After the outer perimeter
bolts are torqued, tighten the bolts along the inner perimeter to 29 ft·lb (39.3 N·m).
Airfoil Hardware (BAF-Supplied):
a. (20) 5/16-18 x 5/8" GR 8 Bolt
b. (20) 5/16 Belleville Washer
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Installing Airfoils (cont.)
Belleville Washer
b
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Isis
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Airfoil Retainer
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Hole A
Hole B