[GSBN] Natural ventilation - a new question

[forum at lamaisonenpaille.com]

I don't see the logic of going through the trouble of installing such a 
cooling system for just a few days a year. Often, when adding 
'solutions' for problems that do not really exist we introduce problems 
that we are unaware of. For instance, a downside to this type of natural 
ventilation (the pipe going through the ground that we call a 'canadian 
well' in France ;-) is that the warm air cooling down in the tube will 
deposit condensation, thus creating an environment that fungi just love. 
Hence, this system needs an airfilter before letting the 'contaminated' 
air in the house in order to maintain a correct air quality. That is 
what I've understood from Habib Gonzalez' who has done research on these 
passive cooling systems for the CMHC. He opened up some of those 
instalations and, if I remember correctly, all of them had fungi growth 
inside.

Have a nice day,

André - sniffing arround - de Bouter
France