Panasonic. The WhisperComfort spot energy recovery ventilator (ERV) is the first ceiling-insert ERV available in the U.S. Using two ducts, the fan exhausts stale air and brings in fresh air from outside. Its low-rate continuous run helps ensure that VOCs and other indoor air pollutants are vented out and replaced with fresh air. The fan’s capillary core adds heat and moisture to the incoming air to temper it and maintain a comfortable indoor living environment. 800.211.7262.