Hog Slat Inc. Newton Grove, NC USA December 2022 10 Air Storm Fans Remove Butterfly assembly crate. Insert 4 cap head screws from the inside of the butterfly assembly (holes are threaded to hold fasteners in place). Tighten with Allen wrench until snug. This step requires (2) installers. Hook the butterfly assembly on the top of the outside of the orifice. Ensure the vertical support is properly aligned and the butterfly is oriented correctly (SEE BELOW IN RED) before continuing. Manipulate the orifice inside the butterfly assembly and loosely attach the mounting brackets with lock nuts. Press butterfly onto the fan assembly until the edge of the throat bottoms out against the vertical and horizontal members of the butterfly assembly. From inside the house attach the butterfly spring bracket as shown. Then attach both supplied springs onto the predrilled holes in the bracket securing the other end to the bolts on the butterfly door using supplied 1/4”- 20 stainless lock nuts from the hardware kit.
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