HVAC Duct Flow Sensor Greystone AVDT is engineered for building automation applications in the HVAC/R industry. Duct airflow sensor measures air velocity and temperature with field-selectable ranges and output options. Designed with a duct-mount probe and an adjustable collar, it is suitable for both round and rectangular ducts. This air velocity sensor also offers optional features including a relay and a backlit LCD display, available in either metric or imperial units. Applications:- Pharmaceutical clean rooms, HVAC systems, laminar air flow cabinets, and biosafety cabinets, etc.