Results are reported on the use of a 5 cm path-length sonic anemometer for the measurement of turbulent fluctuations in the small rooms. Doors and windows were closed with the forced air circulation system turned on. Measurements were taken at three heights (floor, middle and ceiling). Data were recorded for 10-minute periods at 10Hz at each sampling location, defined as a run. Except within the corners or above the vents, the flow was nearly isotropic, with speeds on the order of 15 cm/s. Approximately, 10 to 20% of the measured component velocities were below the threshold of the instrument's uncertainty. The speed threshold of 2 to 5 cm/s will limit the usefulness of this instrument.