The idea for this practice, called Lüften in German, is that once or twice a day you should open the doors and windows for five minutes to let the stale air out and the fresh air in.
ZG: 4
A trend in America which may or may not take off in Australia. Fresh air used to be easy to acquire but in the days of sealed houses and with the threat of mould we may need to take drastic action to get it.
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