An apparatus for providing ventilation in a lower level of a building and for preventing mold and mildew from building up in an interior portion of such building while also preventing entrance of small unwanted animals. The apparatus comprises a frame member having each of a first predetermined shape and a first predetermined size and formed of a first predetermined material. A screen member is engageable with the frame member for attachment thereto, such screen member having each of a second predetermined shape and a second predetermined size and being formed of a second predetermined material. The apparatus is secured to the structure by one of masonry screws or is secured in new construction with bricks and brick mortar.