Löyly

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The prominent characteristic of a well designed sauna - 'Löyly'

 

Löyly (pronounced low-lou) is not just the steam rising from the rocks as many sauna enthusiasts believe but is a combination of several critical elements. 

 

“There is no shortcut to perfect löyly, it is always about stones and proper ventilation.”

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– Jesse Hämäläinen, Narvi Sauna Heaters, Finland, 2012

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“Löyly is the Purity, Temperature and Moisture Content of the air contained inside the sauna as well as its thermal radiation.”

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– 1988 paper on sauna health benefits

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That 1988 paper went on to say “The purity of the sauna air is above all a factor contributing to the enjoyment of the bathing experience. The sauna air must not contain any obnoxious extent gaseous impurities, particles, or micro-organisms. The purity of the sauna air is ensured primarily by effective ventilation.”

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Steam added to stale air is just that – steam added to stale air... it is not Löyly.

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However, if you have a foundation of good fresh air that is not stale from too much CO2, that is free of perfumes, perspiration odors and other impurities and is of the proper temperature then when you add steam produced from ladling water on the stones ... you have Löyly.

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When people in a sauna shout LÖYLY as the steam is produced it is not for the steam itself but because the steam added to the other elements of fresh pure air of proper temperature creates löyly.

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As a design package, that comes free with any sauna you buy, what we provide for the projects is:

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• Calculation of air volumes, heat losses and capacities of heating equipment required

• Drawings for ventilation fittings layout within sauna

• Drawings for door, glazing, cladding & benches layout within the sauna

• Drawings for electrical wiring & sauna operation schematics

• Operation manual for the sauna once finished​

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