BIG ASS FANS Powerfoil X3.0 Guia De Instalacion página 11

4. Determine roof structure mounting points
The angle irons should be aligned with the outermost holes of the upper mount.
Determine the mounting points in the roof structure for the angle irons. Consult the appropriate diagram below
for distances between the angle irons. Dashed lines represent angle irons.
10-7/8" (276 mm)
Ø9/16''
(14 mm)
5-1/2"
(140 mm)
Small Upper Mount (Standard)
13-3/4'' x 9-1/2" (349 x 241 mm)
Direct Mount
Ø9/16'' (14 mm)
5-1/2"
(140 mm)
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Large Upper Mount (Optional)
18-1/2'' x 9-1/2" (470 x 241 mm)
5-1/2" (140 mm)
Top of Main Fan Unit
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15-5/8" (397 mm)
Ø9/16''
(14 mm)
5-1/2"
(140 mm)
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