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SKYBLADE FANS -
Where Form Follows Function
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6
Mounting Method 3: PuRlins
NOTE:
Purlin brackets and hardware are available from SkyBlade Fan Company upon request and not included
standard.
6.6 Selecting Proper Angle Irons
Select the proper angle irons based on the requirements stated under section 6.1.
6.7
Pre-Drill Purlins
Drill four 9/16” (1.4 cm) diameter holes centered vertically along the purlin spaced apart 4.5” (11.4 cm)
horizontally and 1.5” (3.8 cm) vertically. These holes should match up perfectly with those of the purlin bracket
and back plate.
6.8 Attach Brackets and Backing Plates
Purlin mounting brackets and backing plates should be attached using the provided 1/2” grade 5 bolts, washers,
and nylock nuts. A washer should be placed on both sides of the plate for each bolt.
6.9 Pre-Drill Angle Iron Brackets Holes
Your angle iron should be cut to allow 1/2” (1.27 cm) clearance between the end of the angle iron and the purlin
you are mounting to. Drill one 9/16” (1.4 cm) diameter hole centered vertically exactly 1” (2.54 cm) from the
edge on both ends of the vertical wall of the angle iron. Drill a second hole exactly 3” (7.6 cm) inward from the
first hole on both ends. Repeat for the second angle iron. These holes will be used to secure the angle iron to the
purlin bracket with the provided hardware.
6.10 Pre-Drill Angle Iron Fan Mounting Holes
Measure the distance between the mounting points that each angle iron will span. Drill two 9/16” (1.4 cm)
diameter holes centered on the bottom wall of each angle iron. The two holes should be spaced 5.5” (13.9 cm)
apart to best match those of the upper yolk. These holes will attach the upper yolk to the angle iron.
