with parallel simultaneously tiltable lamellae

Full Title

Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening > Air-flow control members, e.g. louvres, grilles, flaps or guide plates (F24F7/013, F24F13/06 take precedence) > movable, e.g. dampers > built up of tilting members, e.g. louvre > with parallel simultaneously tiltable lamellae