Abstract
In order to test the performance of Whole House Fans (WHFs) for use in California residential buildings a 24 inch diameter WHF rated for and airflow of 3440 cfm was tested in accordance to the Heating and Ventilation Institute (HVI) 916 guidelines. The test fan was tested on its highest speed setting at 10 static pressures ranging from 0 Pascals to maximum shut-off pressure. The results showed a maximum of 3606 cfm at 0 Pa. A velocity profile was created to compare the effect of the fan on airflow within the cross-sectional measurement plane by taking pressure measurements from the wall to the center of the duct. The WHF was also tested at various degrees of bending to determine how installation affects the performance. The results showed a decrease in air flow and efficiency with extreme bending as well as higher than rated performance with a straight duct. Finally, a comparison was done using weather data for various climate zones to determine which zones have more opportunity for energy savings.