Vent device having one or more stage ventilation assemblies

A vent device, comprising:

• at least one stage ventilation assembly including an inner layer element and an outer layer element, the outer layer element having an inner side wall and an outer side wall disposed at a distance from the inner side wall, the inner and outer side walls being connected only by a top side of the outer layer element, the inner side wall defining a cavity extending along a first direction through the outer layer element, the inner layer element being arranged in the cavity;
• and
• an air duct formed between the outer layer element and the inner layer element, the air duct having an air duct outlet,
• wherein the outer layer element and the inner layer element are configured to move along the first direction relative to each other to move the at least one stage ventilation assembly between an air duct open position, in which the inner layer element opens the air duct outlet, and an air duct closed position, in which the inner layer element closes the air duct outlet.