Bathroom Ventilation Fan: Equipped with a revolutionary DC/ECM motor and SmartFlow technology, this ultra-slim, whisper quiet, Energy Star-certified exhaust fan provides superior performance and efficiency; Duct diameter: 4" oval Customizable Airflow: Pick-A-Flow technology allows you to select your desired airflow from 50, 80 or 100 CFM at the flip of a switch for your room size and usage needs Easy Installation: A sleek 3-3/8" housing depth fits effortlessly into tight spaces, and the unique L-shaped bracket simplifies installation and provides strong support; UL listed for ceiling, wall, and tub/shower enclosure mounts when GFCI protected. Explore Our Selection: We offer a wide range of vent fans including fans with LED lights, timers, heaters, and condensation sensors for humidity control, plus installation kits, soffit vents, replacement motors and fan cover grilles Healthy Living Begins with Clean Indoor Air: Ensure a healthy home for your family with our high-performance Panasonic ventilation systems, air purification devices and HVAC solutions.