Installation Guide

BIG ASS FAN 4900

Mounting Structure: Bar Joists (cont.)

5a. Direct mount main fan unit (to angle irons)

CAUTION: The main fan unit is heavy. Use caution when raising it.

Attach the main fan unit directly to the angle irons with the Main Fan Unit Hardware as shown. Consult the diagram below for distances

between the angle irons. Note: The fan can only be directly mounted to angle irons. Do not directly mount the fan to an I-beam.

Tighten the bolts to 40 ft·lb (54.2 N·m) using a torque wrench and 3/4” socket. After attaching the main fan unit to the angle irons,

tighten all the bolts securing the angle irons to the roof structure to 40 ft·lb (54.2 N·m) using a torque wrench and 3/4” socket.

Proceed to “Secure Safety Cable” (p. 17).

Main Fan Unit Hardware (BAF-Supplied):

a. (4) 1/2-13 x 1 3/4” GR 8 Bolt

b. (8) 1/2’’ Flat Washer

c. (4) 1/2-13 Nylock Nut

If your fan installation includes yokes and an extension tube, skip this step and proceed to step 5b.

5 1/2”

(14 cm)