The central ventilation system with heat recovery optimally supplies apartments up to 90 m2 in size with fresh air. The optimized heat exchanger and the minimization of the internal resistance enable very quiet and efficient operation. Up to 90% of the heat energy can be recovered from the exhaust air using the efficient cross-counterflow heat exchanger. The particularly compact design ensures that the system disappears unobtrusively into the kitchen unit. Due to the relatively low installation effort, it is now also worthwhile to retrofit an entire apartment with a ventilation system. Simple, logical operation (thanks to the new control panel) Energy-efficient constant volume flow fan Minimal auxiliary energy consumption Intelligent frost protection control Easy maintenance