Dyson fans use air multiplier technology to create a powerful stream of uninterrupted airflow focused mode for long range powerful airflow or diffused mode for wide projection select focused mode to channel and direct a powerful jet of air for long range personal heating no more sitting in front of the heater select diffused mode to project powerful airflow for both wide and long range heat distribution it heats the room quickly and evenly no more cold spots the dyson hot cool fan heat