The WhisperWarmâ„¢ line combines a ventilation fan and a heater in one product. The 110-cfm heaters feature an adjustable directional louver. Both Model FV-11VH1 and Model FV-11VHL1 have a totally enclosed condenser motor, rustproof paint treatment on the galvanized housing, and a built-in damper to prevent a back draft, the company says. The fan speed for these units is 1,080 rpm (1,260 at 0.25-inches static pressure). WhisperWarm units have thermal fuse protection, a Sirocco blower wheel, and a 1,400-watt heating element. In addition to the fan and heater in FV-11VHL1, this model also has a light/nightlight.