Heating, ventilating or cooling device with an air guiding arrangement

Heating, ventilating or air-conditioning system comprises a fan (2), optionally a heating body, optionally an evaporator (4), an air-guiding housing (1), and an air-guiding device (6). The air-guiding device is a separate component that is inserted through a housing opening into the air-guiding housing. Preferred Features: The housing opening lies opposite another housing opening in which the fan is arranged. The air-guiding device is formed by or designed as a filter cover (5).