Because in order for a fan to blow air out it must have an intake of air.
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Most fans are designed to blow air in one direction to create a consistent airflow pattern. As a result, air typically blows out of one side of the fan where the blades are positioned to generate airflow. This design helps to maximize the efficiency of the fan in moving air effectively.
For optimal air circulation in a room, a fan should blow out.
For optimal ventilation, a window fan should blow air out of the room.
A window fan should blow air out of the room to help circulate fresh air and remove stale air.
Position the blow fan facing out of the window for optimal air circulation.
For optimal air circulation, the fan should blow out of the window. This helps to push hot air out and draw in cooler air from outside.