Broan RB80 Ultra Pro Energy Star Qualified Bathroom Fan, 80 CFM, White 80 CFM reduces humidity to quickly eliminate fogged mirrors and manage moisture in bathrooms up to 75 square feet, so your vision will always be clear and your surroundings will always be comfortable QStream technology: state-of-the-art blower design with airflow-smoothing baffles optimally smoothest airflow and reduce turbulence so the wheel can turn more slowly and quietly with no airflow loss QFlow technology: duct connector damper flap is completely removed from airstream to reduce static pressure again, allowing the blower to turn more slowly and quietly, Damper also seals against perimeter surfaces when closed to prevent back drafts Ultra Quick installation technology uses an exclusive telescoping mounting frame with pre-installed screws, snap-in housing, snap-in blower and an inside-out mounting duct connector that deliver the fastest, easiest, most universal installation Retrofit installations can be done entirely from the room-side - no attic access required. This means a faster, easier installation, so you can move on to something else