The TSI Model 8371 AccuBalance® capture hood is an instrument

designed to measure the air flow from diffusers and grilles or the air flow

entering exhaust outlets. The AccuBalance® capture hood is lightweight

and easy to use. The instrument can display the measured air flow in

four different units: standard cubic feet per minute (SCFM), standard

liters per second (Std l/s), standard cubic meters per hour (Std m3/hr),

and standard cubic meters per minute (Std m3/min). All readings may

also be displayed in actual flow conditions.

The AccuBalance® capture hood consists of a fabric hood, a molded

plastic base which contains an electronic meter, and a flow sensing

manifold located within the base. Air flowing through the hood is

measured by a hot-film sensor located in the central hub of the flow

sensing manifold. The twenty-four pairs of flow sensing ports in the

manifold are strategically located so that the AccuBalance® capture hood

provides the highest degree of measurement accuracy, even in nonuniform

flow conditions.

The AccuBalance® capture hood is temperature-compensated to display

a standard flow rate: SCFM, Std l/s, Std m3/hr, and Std m3/min.

Standard flow rate is defined as the volumetric flow rate at standard

conditions of 70°F (21.1°C) and 14.7 pounds per square inch (760

mmHg) barometric pressure. Standard flow rate is the measurement

used most often in ventilation applications.