Ventilation device and ventilation system

A ventilation device, comprising:

• a main body case made of metal, and including a suction port and an exhaust port;
• a fan disposed in the main body case;
• a wireless communications unit including an antenna, and configured to perform wireless communication by using a radio wave having a prescribed wavelength as a medium;
• and
• a controller connected to the wireless communications unit, and configured to control the fan in accordance with a signal received by the wireless communications unit,
• the main body case including:
• a suction section having a box shape, and including the suction port, the suction section having a lower surface, an upper surface, and a front surface connecting a front edge of the lower surface and a front edge of the upper surface;
• and
• an exhaust section positioned on the upper surface of the suction section, and including the exhaust port,
• the suction section including:
• a first opening being in the upper surface, and overlapped with at least part of the wireless communications unit in upward-downward directions;
• and
• a second opening being in the front surface, and overlapped with at least part of the wireless communications unit in forward-backward directions.