Broan HD80 Heavy Duty Ventilation Fan, 80 CFM 2.5 Sones 80 CFM, 2.5 Sones 4" Round Ducting Title 24 Compliant Totally enclosed motor designed for continuous operation UL listed for use over bathtubs or showers when connected to GFCI-protected branch circuit. Totally enclosed motor designed for continuous operation Rugged metal fan grille for added durability, easier cleaning Grille torsion spring-mounted for easy installation Pre-wired outlet box for plug-in motor plate Virtually eliminate follow-up costs associated with service or replacement calls