This study was conducted to develop and evaluate a method that can be used to continuously measure fan ventilation rates in livestock buildings. The method involved measurement of velocity pressures using two tubes with holes. The holes in one tube faced directly upstream to sense total pressure, while those in the second tube faced directly downstream to sense static pressure. Positioning the measuring unit upstream of the test fan and using a 27 in. × 27 in. (68 cm × 68 cm) duct provided the best results. For this setup and at a static pressure of 0.10 in. water (25 Pa), the absolute deviations of predicted values from measured values ranged from 18 cfm (31 m³/h) to 52 cfm (88 m³/h) for the axial fans tested. Additionally, this setup had only slight effects on fan performance. This study demonstrated the potential of using the method for ventilation rate measurement in livestock buildings.

Units: Dual