We deliver a compact ventilation unit for efficient ventilation and high efficiency heat recovery. The unit is designed as “white goods” and can be placed on the floor in a utility room.  The counter-flow heat exchanger uses the energy in the outgoing indoor air to heat the fresh incoming outdoor air. The counter-flow heat exchanger ensures that there is no heat leakage between the incoming and outgoing air. All together the heat exchanger ensures low operating costs, excellent comfort and a good indoor climate.