7+ Air Flow Hood. The testo 420 volume flow hood significantly facilitates volume flow measurement at larger air intakes and vents. When used, it is placed over a vent inside a home to measure the air flow that comes out into the room.
Web airflow capture hoods air capture hoods are used for air balancing and other hvac applications. Web what is an air flow hood? At only 6.4 lbs, it is the lightest volume flow hood on the market.