Turn any fan into a sensing solution with new Sensaire -sensing technology, which can detect a rapid rise in to turn the fan on. It responds to increases in up to 4x faster than other sensors to help improve air quality. Precise sensitivity adjustment allows variable setting from 20% to 80% relative so the fan works when the homeowner wants it to regardless of climate or season. Continuous ventilation mode allows the fan to operate for set minutes per house to achieve targeted average CFM levels and efficiently meet ASHRAE 62.2 whole house mechanical ventilation (WHMV) requirements. This sensing fan offers the flexibility to satisfy local range of adjustment codes, while the decorator style design with settings behind the concealed door blends seamlessly with existing switches. The user adjustable delay shut off times allows run-time customization for different bathrooms within your home.