Development, construction, assembly of ventilation devices (central and decentralized). Also large equipment for fitness studios, offices, sales rooms, social rooms etc... If a countercurrent plate heat exchanger is operated in "continuous operation", the building or the breathing air becomes drier, which is not always desirable. It makes sense to set the ventilation to high and carry out shock ventilation as usual. Therefore, do not choose devices that are too small. Difference 1: Although the humidity drops during short periods of strong ventilation, it quickly recovers from the building materials, etc. Difference 3: The device does not freeze at temperatures below zero. This allows us to avoid preheating the intake air, which prevents the device from achieving the greatest possible.