Abstract :
It appears to be the practice to state the volume of air displaced per minute by a ceiling fan without any reference to the conditions under which the measurements are made. The tests detailed in this paper were undertaken to determine the influence upon the measured volume of air of: (a) Distance of plane of observation below fan blades. (b) Position of fan in, and size of, room. (c) Height of fan above floor. (d) Distance between fan and ceiling. (e) Room temperature. (f) Speed of fan. Recommendations are made relating to the conditions under which air velocities should be observed.
