The Haiku by Big Ass Fans ceiling fan has a silent motor, top-in-class airflow, sustainable materials and a minimalist design. The Sensorless Drive Technology delivers an 80 percent improvement in efficiency compared to conventional ceiling fan motors, which exceeds Energy Star requirements by 450 to 750 percent. The fans run on two to 30 watts. The fan produces less than 34 dBA. Airfoils are crafted from bamboo.