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There is a number of guidelines for the operation of public sauna facilities, which, amongst other things, requires a fivefold air exchange in the sauna. Without a heat recovery system an enormous amount of the energy is lost through the exhaust air of the sauna. In a commercial installation, it is therefore useful to reuse the excess heat, which is usually directed outside, for other purposes. It is possible to use the heat for neighboring rooms, or to reuse it within the water system.