Abstract: A double insulated, ventilating skylight for a building or the like, comprising inner and outer substantially co-extensive frames, each of the frames having at least one substantially rectangular vertical wall and an upwardly directed window panel, the vertical walls having substantially co-extensive openings therethrough. Inner and outer doors are hingeably mounted on the inner and outer frames respectively to close the openings or to provide ventilation therethrough. Means for opening and closing the inner door from within the building is provided, with linkage means connecting the outer door to the inner door so that both doors open and close simultaneously.