Typical Installations
Models G and GB
General Clean Air (figure 1)
Models G and GB exhaust fans are designed to meet the needs of general clean air applications.. Tests were conducted to assure safe, rugged and reliable fans..
Due to the varying types of airstreams encountered in commercial ventilation, system designers must be aware of national, state, and local codes and guidelines governing these installations.. Local code authorities should be consulted before proceeding with any ventilation project.
•When roofing materials extend to the top of the curb, roof curbs should be 11⁄2 inches (3⁄4 inch on each side) less than the unit curb cap to allow for roofing and flashing..
•For recommended duct size, damper size, and roof opening dimensions, refer to the performance data pages.. (starting on t.. 14)
•Installation must include a means for inspecting, cleaning and servicing the exhaust fan..
High Wind, Hurricane and Seismic (figure 2)
•Roofing materials can extend to the top of the curb, roof curbs should be 1 inch (25 mm) total, or 1⁄2 inch (13 mm) on each side, less than the unit curb cap to allow for roofing and flashing.
Note: The typical installations shown are recommendations based on national codes. Local authority may supersede these recommendations.
Factory Wired from Motor to Disconnect
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| 3/4 in. |
| 8 or 12 in. |
Wiring by | (19 mm) |
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| 11/4 in. | Recommended | 11/4 in. |
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| (32 mm) | Damper Size | (32 mm) |
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figure 2 |
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| 11/4 in. (32 mm) |
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Wheel Rotation
Direction of rotation is very critical. Rotation in the wrong direction will result in excessive horsepower, possible motor burnout, and increased noise levels. Check rotation by energizing the unit only momentarily. The rotation should be the same as the rotation decals affixed to the unit and is clockwise when viewed from the top of the unit..
Clockwise
12