Installation Guide

BIG ASS FAN 4900

Installing Airfoils

WARNING: Disconnect power to the fan before installing the airfoils.

1. Attach winglets to airfoils

Attach the winglets to the airfoils using the Winglet Hardware as shown.

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secure the fasteners. Attach winglets to all six airfoils before attaching

the airfoils to the fan.

Winglet Hardware (BAF-Supplied):

a. (6) 10-24 x 3/4” Barrel

b. (6) 10-24 x 1/2” Bolt

2. Attach airfoils to hub

Slide the airfoils onto the tabs of the fan hub. The airfoils

must be attached to the fan hub with the curved sides facing

downward.

Attach the six airfoil retainers with the Airfoil Hardware. Moving

clockwise around the fan hub, position the airfoil retainers end

over end as shown. Hole A of the retainer should be positioned

over top of Hole B. Do not tighten the bolts until all the airfoil

retainers have been attached!

Tighten the bolts along the outer perimeter to 29 ft·lb

(39.3 N·m) using a torque wrench and 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) using a torque wrench

and 1/2” socket.

Airfoil Hardware (BAF-Supplied):

a. (12) 5/16-18 x 2’’ GR 8 Bolt

b. (24) 5/16” Flat Washer

c. (12) 5/16-18 Nylock Nut

Hole B

Hole A

Airfoil Retainer

Big Ass Fans recommends completing electrical installation (p. 20) before installing the airfoils.