Air flow velocity is measured at four locations on a representative floor. The floor has two zones and flow is measured on the hot and cold decks for each zone. The type of sensor used is an electronic hotwire anemometer air flow sensor. The sensor is inserted about 5" into the air ducts and returns a linear output voltage and proportional to air velocity. The air velocity is multiplied by the cross-sectional area of the duct to obtain air volume in cubic feet per minute. The repeatability of the sensor is ±0.5%.