Heating and/or air-conditioning system

The system has an air delivery device (11), a heat exchanger and preferably an evaporator for conditioning air. The air delivery device feeds fresh air sucked in from the exterior or circulated air from the interior via the heat exchanger and/or the evaporator and/or one or more channels into the interior. The air delivery device has a tangential disk fan (2) with its air inlet and outlet openings in a plane.