A box fan is a type of portable electric fan that is typically square or rectangular in shape. It is designed to circulate air in a room, providing a cooling effect during hot weather. Box fans usually come with multiple speed settings and can be placed on the floor or in a window to draw in fresh air or exhaust stale air. These fans are popular for their energy efficiency and affordability compared to air conditioning units. Many people use box fans in conjunction with air conditioning systems to enhance airflow and reduce energy costs. They are also lightweight and easy to move, making them convenient for various settings.