Broan. The Energy Star-rated Ultra Silent Select-Air ventilation fan (QTRE080C2S) can be customized with one- or two-function controls; its low setting produces a constant flow of 40 CFM while its boost setting offers 80 cfm for maximum ventilation. In addition, the fan provides quiet operation at less than 0.3 sones in low mode and 0.8 sones in boost mode. The fan is UL listed for bathroom use with a GFCI circuit. 800.558.1711. www.broan.com.