- Polycarbonate Heat-Resistant Lens with U.V. Inhibitors, Easy Removal and Installation of Motor Assembly Key-Hole Mounting, Permanently Lubricated Motor, Precision-Balanced Impeller for Quiet Operation, Galvanized for Humid Conditions and Various Attic Temperatures, Gauge Markings for Ceiling Thickness, Built-In Junction Box for Easy Wiring, Includes 4" Duct Adapter
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