A device for closing an opening in the masonry of a building, said device: - comprising a shutter and motorized drive means for rotating the shutter about an axis, these motorized drive means comprising: - a motor comprised by the shutter; - meshing means, comprised by the shutter and which are driven by said motor; - complementary meshing means, which engage with the meshing means of the shutter, and which are designed to be fixedly secured to the masonry; - characterized in that: - the shutter comprises a recess, whereas the motor is at least partly housed inside this recess; - the meshing means are constituted by a toothed wheel whereas the complementary meshing means are constituted by a toothed or notched circular sector, which engages directly with the toothed wheel constituting the meshing means, and which are comprised by an outer edge that is comprised by at least one disc portion intended to be fixedly secured to the masonry; - it comprises, on the one hand, means for mounting the shutter on the masonry of the building, in rotation about said axis of rotation of the shutter, these mounting means comprising a hinge pin and, on the other hand, securing means for fixedly securing the complementary meshing means to the masonry, said securing means comprising means for attaching the complementary meshing means to said hinge pin. - comprising a shutter and motorized drive means for rotating the shutter about an axis, these motorized drive means comprising: - a motor comprised by the shutter; - meshing means, comprised by the shutter and which are driven by said motor; - complementary meshing means, which engage with the meshing means of the shutter, and which are designed to be fixedly secured to the masonry; - characterized in that: - the shutter comprises a recess, whereas the motor is at least partly housed inside this recess; - the meshing means are constituted by a toothed wheel whereas the complementary meshing means are constituted by a toothed or notched circular sector, which engages directly with the toothed wheel constituting the meshing means, and which are comprised by an outer edge that is comprised by at least one disc portion intended to be fixedly secured to the masonry; - it comprises, on the one hand, means for mounting the shutter on the masonry of the building, in rotation about said axis of rotation of the shutter, these mounting means comprising a hinge pin and, on the other hand, securing means for fixedly securing the complementary meshing means to the masonry, said securing means comprising means for attaching the complementary meshing means to said hinge pin. - a motor comprised by the shutter; - meshing means, comprised by the shutter and which are driven by said motor; - complementary meshing means, which engage with the meshing means of the shutter, and which are designed to be fixedly secured to the masonry; - characterized in that: - the shutter comprises a recess, whereas the motor is at least partly housed inside this recess; - the meshing means are constituted by a toothed wheel whereas the complementary meshing means are constituted by a toothed or notched circular sector, which engages directly with the toothed wheel constituting the meshing means, and which are comprised by an outer edge that is comprised by at least one disc portion intended to be fixedly secured to the masonry; - it comprises, on the one hand, means for mounting the shutter on the masonry of the building, in rotation about said axis of rotation of the shutter, these mounting means comprising a hinge pin and, on the other hand, securing means for fixedly securing the complementary meshing means to the masonry, said securing means comprising means for attaching the complementary meshing means to said hinge pin. - the shutter comprises a recess, whereas the motor is at least partly housed inside this recess; - the meshing means are constituted by a toothed wheel whereas the complementary meshing means are constituted by a toothed or notched circular sector, which engages directly with the toothed wheel constituting the meshing means, and which are comprised by an outer edge that is comprised by at least one disc portion intended to be fixedly secured to the masonry; - it comprises, on the one hand, means for mounting the shutter on the masonry of the building, in rotation about said axis of rotation of the shutter, these mounting means comprising a hinge pin and, on the other hand, securing means for fixedly securing the complementary meshing means to the masonry, said securing means comprising means for attaching the complementary meshing means to said hinge pin.