30 LOW PROFILE UNDER-CABINET VENTILATION HOOD For cooks who have more to make but less undercounter space, this Perimeter Ventilation hood clears the air edge-to-edge with a powerful 400 CFM Class motor, yet with a low profile that leaves room for culinary exploration. Whisper Quiet® System maintains a hushed 0.1 sones (43 dBA) at low speed. Heat-sensor-enabled Auto Speed Setting helps busy cooks keep their cool.