from associated equipment such as a clothes dryer interiorly of a building wall 16 to vent discharge exteriorly of the wall 16 the vent duct outlet or hood assembly 12 is connected to the wall 16 such as by nailing or screwing with retainment elements 15 and extends outwardly of the wall 16 the hood assembly 12 may have a movable closure flap 18 hingedly connected at 19 the flap 18 if used moves between a substance discharge position 20 which permits the exhaust substance to be discharged through the hood assembly 12 and a gravity biased closed vertical position against the mounting panel 21 of the hood assembly 12 providing a loosely held closure of the hood assembly 12 the hood assembly 12 is provided with side panels 40 top panel 42 and an exterior facing slanted panel 44 the panel 44 of hood assembly 12 is slanted so as to baffle or direct lint particles downwardly rather than straight ahead into the surrounding yard a duct 14 with a 4 inch diameter for example may have a hood assembly 12 with an approximately 4 inch u00d7 4 inch opening 48 of course the size of the hood assembly could be modified for varying outputs and could be made larger or smaller depending on the duct size in addition the opening 48 need not be square and therefore the sides could be made slightly larger or smaller to accommodate design requirements as shown in fig2 and 3 a preferred embodiment of the present invention comprises a.