replaced application_number US 39705803 A description referring now to the drawings in which like reference numerals index like parts there are shown the preferred embodiments of the present invention both as a cold or hot air vent and as a cold air return vent the embodiment illustrated in fig1 is intended for use as a duct end filtering apparatus for attachment most commonly to a heating or air conditioning vent in the embodiment illustrated in fig1 the housing element 26 mounts to a surface by means of screws 22 the housing has predrilled holes to accept the screws 24 which predrilled holes are located such that they will not preferably be visible from the exterior of the apparatus when it is fully assembled the louvered grill 12 attaches to the housing 26 first by means of the hinge flanges 10 which are accepted by the corresponding hinge notches 18 the filter 14 is placed behind the grill element 12 by sliding it behind the grill 12 into the bezel 16 attached to the grill 12 the grill is then affixed to the housing element 26 by means of the snap fit flanges 20 when the entire apparatus is assembled the extensions 28 protruding from the.