Kanomax 6824 Rotating Vane Anemometer. The Kanomax 6820 series of vane anemometers are highly accurate airflow measuring devices which include an industrial grade enclosure and probe. They automatically calculate volume flow in CFM (cubic feet per minute) or CMH (cubic meters per hour). When measuring ducts dimensions are stored in memory on turn-off and do not need to be re-entered. These vane anemometers can store up to 10 different commonly-used duct sizes for quick, convenient readings in the field. Models also available for airflow / temperature and airflow / temperature / humidity.