US Patent 11272789 Seat

A seat includes a backrest, and a fan that is installed on the backrest at a position corresponding to a height of a head of a sitter sitting on the seat and generates an airflow flowing from a front toward a rear of the backrest. The seat may further include a sitter detector that detects the height of the head of the sitter, a lifting-and-lowering motor that adjusts a height of the fan, and a lifting-and-lowering controller that controls the lifting-and-lowering motor. The lifting-and-lowering controller may control the lifting-and-lowering motor to adjust the height of the fan to the height of the head of the sitter detected by the sitter detector.