PipeCarver
Supporter
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the only airflow is draft in most old homes the heat just flows out and cold air flows in. Not a very efficient way to ventilate. We tightened them up too much in the 70's and there were problems with sick building syndrome I think it was with poor ventilation causing a bunch of illness with respiratory illnesses like asthma and such.I agree but is it the environment (temp, humidity) or is it "fresh" air? My understanding is mold spores are everywhere and only when the conditions are right will they thrive. So the question I have is what is "fresh air" or "stagnant" air?