Directly Mount Main Fan Unit To Angle Irons - Bigass 4900 Manuel D'installation

2. Directly Mount Main Fan Unit to Angle Irons

If you are installing the fan with an extension tube, skip to step 3a (I-beam) or 3b (angle irons).
Attach the main fan unit directly to the angle irons with the Main Fan Unit Hardware. Consult the diagram 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 securing 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 step 5.
Main Fan Unit Hardware:
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
CAUTION: The main fan unit is heavy. Use caution when raising it. The fan weighs 150 lbs (60 kg). A
suitable means for lifting the weight of the fan, such as a scissor lift, and at least two (2) installation
personnel will be required.
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ATTENTION
a
b
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