Airborne microorganism contamination was investigated in naturally and mechanically ventilated buildings. Air was sampled with SAS system and cultured on general media for total count and on media for fungi; data were related to other indoor contaminants and to microclimatic parameters. Comparison of winter versus summer microorganism concentrations was not significant. No major difference of detected species was observed between naturally and mechanically ventilated buildings.
Many modern office and residential buildings in Sweden include an atrium. The atria are often mechanically ventilated and sometimes they are heated. Very little is know about the ventilation and air infiltration in built atria. These issues were examined in an apartment building with a non-heated and mechanically ventilated atrium, built in 1986 in Sweden. The ventilation of the atrium is coupled to the apartments.
A new miniature mechanical ventilation system with both supply and extract air and an air-to-air heat exchanger has been developed in Great Britain and Denmark. The system which is intented to ventilate a single room has the dimensions of a shoe box and can be placed/installed on the inside wall in an existing air vent. The system can operate with two air flows, 40 or 70 m³/h. At the low speed the noise is insignificant, intended to be "not disturbingN in sleeping rooms.
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