Method for pneumatic matching in central ventilation systems comprising a ventilation unit and distributors branching off from manifold connections for individual room ventilation in buildings with rooms with air inlets and outlets , wherein at least some individual rooms can be closed by doors, wherein overflow openings are provided between the rooms, through which the supply air from rooms with air outlets can overflow into the rooms with air inlets , wherein the ventilation unit comprises at least one fan , at least one volumetric flow sensor for detecting the total volumetric flow conveyed and at least one differential pressure sensor for detecting the pressure difference between the environment and the manifold, characterised by the steps of a) determining the characteristic values k i for the individual room air volumetric flows by means of the sub-steps a1) Operating the at least one fan at a first operating point with unsealed air inlets and air outlets , with unsealed overflow openings and sealed doors of the rooms, a2) measuring at least one differential pressure Δp with one of the at least one differential pressure sensors and the associated volumetric flow V with at least one of the at least one volumetric flow sensors , a3) closing an air inlet or outlet i , a4) operating the at least one fan at a second operating point with the differential pressure Δp measured in substep a2), a5) measuring the associated volumetric flow V̇' i with at least one of the at least one volumetric flow sensors , a6) determining and storing a characteristic value related to the air inlet or outlet i k i = (V - V'i) / V a7) opening the air inlet or outlet i closed in sub-step a3), a8) repeating substeps a3) to a7) for each additional air inlet or outlet , b) comparing the characteristic values k i with set characteristic values k i,set for the individual room air volumetric flows, c) calculating new throttle values for throttles assigned to the air inlets and outlets with the aim that the individual room air volumetric flows assume the set values k i,set , d) changing the calculated new throttle values at the throttles . a) determining the characteristic values k i for the individual room air volumetric flows by means of the sub-steps a1) Operating the at least one fan at a first operating point with unsealed air inlets and air outlets , with unsealed overflow openings and sealed doors of the rooms, a2) measuring at least one differential pressure Δp with one of the at least one differential pressure sensors and the associated volumetric flow V with at least one of the at least one volumetric flow sensors , a3) closing an air inlet or outlet i , a4) operating the at least one fan at a second operating point with the differential pressure Δp measured in substep a2), a5) measuring the associated volumetric flow V̇' i with at least one of the at least one volumetric flow sensors , a6) determining and storing a characteristic value related to the air inlet or outlet i k i = (V - V'i) / V a7) opening the air inlet or outlet i closed in sub-step a3), a8) repeating substeps a3) to a7) for each additional air inlet or outlet , b) comparing the characteristic values k i with set characteristic values k i,set for the individual room air volumetric flows, c) calculating new throttle values for throttles assigned to the air inlets and outlets with the aim that the individual room air volumetric flows assume the set values k i,set , d) changing the calculated new throttle values at the throttles . <EOS>