Abstract: A screen supporting frame for a ventilation opening in a building is disclosed. The frame is formed of a sheet metal strip cut and bent along its longitudinal access to provide a first generally flat portion for assuming a substantially flush position against the outside surface of the building when mounted, a second portion angularly extending from said first portion to form one or more longitudinally extending slots in which the screen or grate may slide permitting the installation removal thereof without tools. A sheet metal strip is further cut and bent transversely to its axis to provide one or more flexible third portions extending substantially orthogonal to the first portion in the direction opposite the second portions for extending inside the soffit opening and engaging in inside surface thereof to mount the first portion in the flush position without the aid of tools and connected at opposite ends thereof to form a rectangular frame sized to fit the opening.