Hog Slat Inc. Newton Grove, NC USA January 2025 8 Air Storm Fans 2. The butterfly assembly comes pre-installed onto housing. Inspect orientation of butterfly Correct orientation of the butterfly is critical to correct operation. This side up decal should indicate orientation. If decal is absent orientation can be determined by location of bolt on vertical upright of butterfly. It should be oriented toward the top of the fan. 3. This step require (2) installers. Place bottom of fan assembly onto the top of the 2”x4”, rotate until fan interior face of fan mates with the wall then secure using sheet metal screws (805060) the outer hole pattern is for the large rough opening, inner hole pattern for small rough opening.
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