Broan. Energy Star Ultra Series ventilation fans continually monitor their performance and adjust speed to ensure the correct amount of air movement. Available in both single- and multispeed versions, the fans offer virtually silent operation (0.3 sone), the company says. In addition, installation is fast, thanks to a telescoping mounting frame and an easy-to-insert blower and housing that snap into place. 800.558.1711. www.broanultra.com.