The invention relates to an air mixer vent, designed in particular for a motor vehicle air conditioning system. The connector block may include a port. If buffered content is not available, the user may be offered similar content that is available as on-demand content, or as other recorded content, for example, stored on a digital video recorder. The O-rings are compressed during manufacture of the seal assembly and the valve more than typically recommended by O-ring manufacturers. The flow straightening plate partitions the passage into a plurality of flow straightening channels. The structures have a mean spacing from one another which is smaller than the wavelength for operating the component.