An openable room closure arrangement, in particular a skylight, for closing a room against an environment, comprising - a curb, - a room closure element, - a drive and - at least one transmission device, wherein the room closure element can be moved relative to the curb by means of the drive, wherein a driving force made available by the drive can be transmitted to the room closure element by means of a transmission device, wherein the room closure element is in contact with the curb around the periphery when a closed position is present, in such a way that it seals the room at least rain-tight against the environment, wherein the room closure element is moved away from the curb in the presence of a SHE (Smoke and Heat Extraction) position, in such a way that a flow cross-section which forms the flow connection between the room and the environment is freed to the maximum, wherein the transmission device comprises at least one elongated swivel arm, which is mounted on the curb swivellable about a swivel axis, wherein at least one coupling means, by means of which the room closure element and the swivel arm are connected to one another in a force-transmitting manner, is arranged at a distance from the swivel axis, wherein the drive engages with the swivel arm thereby forming a lever arm in relation to the swivel axis, so that the swivel arm can be swivelled about the swivel axis by means of the drive, characterised in that the room closure element comprises at least one movement frame, by means of which at least one surface segment of the closure element can be moved relative to the swivel arm, wherein the movement frame comprises at least one rail system, wherein at least the surface segment of the room closure element can be moved in a translatory manner relative to the swivel arm by means of the rail system. - a curb, - a room closure element, - a drive and - at least one transmission device, wherein the room closure element can be moved relative to the curb by means of the drive, wherein a driving force made available by the drive can be transmitted to the room closure element by means of a transmission device, wherein the room closure element is in contact with the curb around the periphery when a closed position is present, in such a way that it seals the room at least rain-tight against the environment, wherein the room closure element is moved away from the curb in the presence of a SHE (Smoke and Heat Extraction) position, in such a way that a flow cross-section which forms the flow connection between the room and the environment is freed to the maximum, wherein the transmission device comprises at least one elongated swivel arm, which is mounted on the curb swivellable about a swivel axis, wherein at least one coupling means, by means of which the room closure element and the swivel arm are connected to one another in a force-transmitting manner, is arranged at a distance from the swivel axis, wherein the drive engages with the swivel arm thereby forming a lever arm in relation to the swivel axis, so that the swivel arm can be swivelled about the swivel axis by means of the drive, characterised in that the room closure element comprises at least one movement frame, by means of which at least one surface segment of the closure element can be moved relative to the swivel arm, wherein the movement frame comprises at least one rail system, wherein at least the surface segment of the room closure element can be moved in a translatory manner relative to the swivel arm by means of the rail system.