Adjustable air conduit means, in particular for an air distributor of a vehicle air conditioner

The adjustable air guiding device, especially for an air distributor of a motor vehicle's air conditioning system, has a pivotable flap (24) installed inside an air duct (12) for at least partial closing off or opening of the flow passage of the air duct. The pivot axis (26) of the flap is located parallel to the longitudinal direction of the air duct and approximately centrally in the air passage of the duct. The surface of the flap is located parallel to a vertical duct section.