Abstract: Device for conditioning air in an enclosed space, including first and second sorption units, each for being transferred from a sorption mode into a desorption mode and vice-versa; and to, in the sorption mode, sorb the one or more air constituents from air of the enclosed space; and to, in the desorption mode, desorb the one or more air constituents, and including an air distribution device to, in a first operating state, switch to a second operating state in which exchange of the air of the enclosed space with exterior air may be provided, if it is determined that a concentration of at least one air constituent of the one or more air constituents is above a limit, and, in the second operating state, switch to the first operating state, if it is determined that concentrations of all air constituents of the one or more air constituents are within their corresponding limit.