Features: Features a powerful 80 CFM blower, specifically designed for continuous use application Pre-installed screws, snap-in housing, snap-in blower and an inside-out mounting duct connector make installation quick and easy Retrofit installations do not require attic access and can be completed entirely from room-side Telescoping mounting frame adjusts from 14"? to 24"? and fits any type of joist, I-Joist or truss construction Snap in housing and blower make installation easier since you can hear and feel when they are properly seated UL Listed for use over bathtubs and showers with a GFCI circuit Product Technologies: ULTRAQuick™: Installation technology makes use of an exclusive telescoping mounting system with pre-installed screws, snap-in blower, snap-in housing and an inside-out mounting duct connector. The result is 60% faster retrofit installations and up to 20% faster new construction jobs, saving you time and aggravation. QStream™: A new take on bath fan blower design evens out airflow by way of smoothing baffles and a more efficient, slower turning wheel. The result is a quieter fan that does not sacrifice power. QFlow™: Damper flap is completely removed from airstream to reduce static pressure and allow the blower to turn more slowly and quietly. Rubber seals on the damper provide a more snug fit to perimeter surfaces, preventing backdrafts. Low Sones: We know that comfort and ambience matter in your bathroom. This fan produces 0.3 sones of sound output, keeping your bathroom quiet and peaceful. Low CFM Capacity: This fan has an efficient 80 CFM (cubic feet per minute) of clearing capacity designed for smaller bathrooms. Controlling humidity in your bathroom extends the life of your décor and makes for a more hospitable space to prepare for the day ahead. Specifications: CFM: 80 Sones: .3 Duct Size: 4 Inch Round Grille Width: 14 Inches Grille Length: 13 Inches HVI Certified: Yes Housing Length: 11-3/8" Housing Width: 10-1/2" Housing Depth: 7-5/8" Product Variations: RB80 (This Model): 80 CFM RB80L: 80 CFM, Fluorescent Lighting, Night Light RB110: 110 CFM RB110L: 110 CFM, Fluorescent Lighting, Night Light