20050055920Adjustable housing assembly2005-03-17Lajewski52/302.1 6805627Security cover for ventilation duct2004-10-19Marts et al. 6767281Passive venting device2004-07-27McKee 6612924Passive venting device2003-09-02Mantyla et al. 20030050006Security air vent2003-03-13Myint ...