Installation Guide

BIG ASS FAN 4900

Mounting Structure: Bar Joists (cont.)

3. Fasten angle irons together (if span is longer than 8 ft)

If the angle iron span is longer than 8 ft (2.4 m), it is necessary to use double angle irons.

Locate the center of the angle iron length. Drill Ø9/16” (1.4 cm) hole through the center of the vertical wall of the angle iron. Drill a total

of four angle irons.

Place two drilled angle irons back to back. Fasten the angle irons together with customer-supplied Ø1/2-13 Grade 8 hardware and

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

Repeat this step for the remaining two angle irons.

Proceed to step 4b.

Grade 8 Hardware (Customer-Supplied):

a. (2) 1/2-13 Bolt

b. (4) 1/2” Washers

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

2. Pre-drill angle irons

Drill two Ø9/16” (1.4 cm) holes exactly 5-3/8” (13.7 cm) apart in the centers of two angle irons.

Measure the distance between the mounting points of the roof structure that the angle irons will span. Measure the same distance on

the angle irons and drill Ø9/16” (1.4 cm) holes through each end of the angle irons. Drill holes in two angle irons if the span is 8 ft

(2.4 m) or less. Drill holes in 4 angle irons if span is greater than 8 ft (2.4 m).

If the angle iron span is 8 ft (2.4 m) or less, skip step 3 and proceed to step 4a.

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mounting structure.

Mount with extension tube: 5-3/l8’’ (13.7 cm)

Direct mount: 5-1/2’’ (14 cm)

Distance between roof structure mounting points

1/2 A

Ø 9/16’’ (1.4 cm)

Side view