A ventilation hood comprises: a main frame that is accessible from the front of a device, faces the device, and defines a through hole through the main frame; a motor which is configured to suck in air through the through hole, and has a duct and a shaft; a motor module of the main frame driven by the motor and having a blowing direction perpendicular to the shaft of the motor; and a controller for controlling the operation of the ventilation hood and the rotational speed of an exhaust fan. The shaft of the motor is formed in a direction from the front of the device to the rear of the device. The controller is on the main frame and is placed on the front of the duct corresponding to the front of the device.