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A ventilation exchanger, so-called FTX, only handles the ventilation in a house. It ensures that the warm outgoing air transfers its energy to the incoming outdoor air. In this way, you get temperate air in the accommodation, as well as saving energy¬. Houses built in the 1980s and 90s usually have an FTX in combination with district heating, electric radiators, or electric boiler. Newer homes with district heating need to supplement with an FTX to meet building regulations. And together with ground source heating/air water, an FTX gives the comfort of temperate supply air, instead of taking in outdoor air directly through wall vents.