Although the breathing window is still in statu nascendi it seems to be the right answer to the question of desired customised ventilation. Time will prove. A coincidental not foreseen advantage compared to the usual plate heat exchangers is that the fine-wire heat exchanger does hardly get frosted up. The explanation is not simple. Is it sublimation? Is the frost evaporation so short that the forming of ice does not take place? [5].
Applied in hospitals the fine-wire heat exchanger can easily be renewed to prevent infection.
The range of application is wide. For instance it fits into a specific small mounting in boats and caravans / mobile homes, and one can use it in offices for night cooling instead of air-conditioning. [6].

The CO2 meter is a very accurate smoke detector too, which signals fire alarm even before any smoke develops. The weak point at the moment is the noise from the fans and positive displayment fans still are not available on the market. They have to be made.

The breathing window will be developed and produced in the coming years. According to the inspired people who work on it, we believe the breathing window will be the beginning of the end of the traditional mechanical ventilation systems in spaces situated at the outer walls of buildings.

Jon Kristinsson
Kristinsson-Reitsema BV, Deventer, Netherlands
Retired professor Environmental Technics and Design 2 Department of Architecture, Delft University of Technology Netherlands.
Co-owner Kristinsson Architects and Engineering.