This Drawing is of Blade Angle of AC In detail. The purpose of fan blades is, The primary function of fan blade is to push air downward while creating a downward raft and making the room feel cooler. As an outcome, these blades can push air either up towards the fan or downwards towards floor. The blade rotation should be set to counterclockwise for cooling, while a clockwise rotation helps to redistribute warm air during the heating season. Ceiling fans can make a huge difference as a complement to your HVAC system. For more details and information download the drawing file.