Easy Installation: Flex-Z Fast Bracket simplifies installation with a single-hinge bracket for easy positioning so you don''t need to access your attic to install the fan and includes options for 4'' or 6'' ducting

Customizable Airflow: This whisper quiet, Energy Star-certified fan features a DC/ECM motor and Pick-A-Flow technology that allows you to select your desired airflow from 50, 80 or 110 CFM at the flip of a switch for your room size and usage needs