Ventilator

A ventilator comprising:

• a refrigerant circuit through which a refrigerant flows and that comprises:
• a compressor, first heat exchangers, and a second heat exchanger that are connected by a refrigerant pipe;
• air supply fans that supply air from an outdoor space to indoor spaces through the first heat exchangers;
• an exhaust fan that exhausts air from the indoor spaces to the outdoor space through the second heat exchanger;
• an exhaust-side casing that accommodates the second heat exchanger and the exhaust fan;
• air supply-side casings that accommodate the air supply fans;
• and
• air supply units that accommodate the first heat exchangers and the air supply fans in the air supply-side casings, wherein
• the exhaust-side casing is separated away from the air supply-side casings,
• the exhaust fan and the exhaust-side casing are disposed in the outdoor space, and
• each of the air supply units supplies the air from the outdoor space to a respective one of the indoor spaces.