Field tests with 20 centralized and 60 decentralized mechanical ventilation systems.
High deviations between supply and exhaust of up to 60%.
The mean total recirculation was 6.5% for centralized and 13% for decentralized devices.
The specific fan power was measured with 0.475 Wh/m3 for centralized and 0.22 Wh/m3 for decentralized systems.
The mean temperature change rate was 0.65 for centralized systems and 0.7 for decentralized systems.