Filtering and humidity measurement in exhaust air of baths and toilets without windows.

The inadequate dissipation of hurnidity fiom living spaces and bathrooms has become asignificant problem area in recent years. This can be attributed both to the replacement of old,poorly sealed windows by new windows with better seals, and to the increasing use of tilesand other building materials which hinder an adequate absorption of water vapour.The residents tend to reject repeated opening of the windows for ventilation purposes ongrounds of the ensuing energy costs. The result is the formation of mould both in the livingrooms and in the bathrooms.The installation of humidity controlled ventilation in bathrooms without windows involvesthe danger, that a drop below the dew point at the hurnidity sensor may lead to unwantedcontinuous operation. This, in turn, will result in a very short service life for the filters andexcessive energy consumption.Possible solutions are to be sought both in the construction of the building and in a controlledprocess of ventilation.