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. <EOS>