Installation Guide

BIG ASS FAN 2025

Installing the Fan (cont.)

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

If the angle iron span is 8 ft (2.4 m) or less, proceed to

step 4a on the following page.

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 Ø 9/16” (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 Grade 8 hardware.

Align the angle irons to each other and tighten the bolts to 25 ft·lb

(33.9 N·m) using a torque wrench with a 3/4” or 19 mm socket.

Repeat step for remaining two angle irons.

Proceed to step 4b.

Angle Iron Hardware (Customer-Supplied):

a. (2) 1/2-13 or M12 Bolt

b. (4) 1/2” or M12 Washer

c. (2) 1/2” or M12 Nut

2. Pre-drill angle irons

Drill two Ø 9/16” (1.4 cm) holes exactly 5-1/2” (14 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 Ø 9/16” (1.4 cm) holes through each end of the angle irons. Drill holes in two angle irons if span is 8 ft (2.4 m)

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

Ø 9/16" (1.4 cm)

distance between roof

structure mounting points

5 1/2” (14 cm)

1/2 A

Ø 9/16" (1.4 cm)

Side view