Annex VIII is a two year task sharing project, started offically in 1984. Although some research had already been done on the problem of inhabitant's behaviour with regard to ventilation, none had gone so far as to access whether and how the ventilation behaviour can be modified in order to save energy and by taking into account the conflicting requirements, energy conservation and adequate indoor air quality.
This paper describes one of the results of the IEA-annex 8 "Inhabitants behaviour with regard to ventilation". Annex 8 has shown that the occupants can play a rather important role with regard to the ventilation rates inoccupied buildings. This paper gives some practical 'rules of thumb' for estimating air flow rates through open windows. An overview of measured and estimated ventilation rates in houses is given from which a simplified approach is derived that takes into account the air tightness of the building and the behaviour.
Within the framework of the International Energy flgency (IEA) Annex VIII , "Inhabitants Behaviour with Regard to Ventilation" an investigation has been carried out on the use of windows in an apartment building in Schiedam. The measurements have been done by the TNO Division of Technology for Society. They started in November 1984 and stopped in May 1986, Three inquiries and diaries have been set up in the tno heating seasons and the summer period to get additional information from the dwellers, In the 6th AIC conference  paper 20 dealt with the first heating season of this project.
The report of the investigation into the possibilities for saving energy by closing (large) windows in good time after, for example, the so-called 'airing' of bedrooms, initiated by the Netherlands Ministry of Housing and Environment's Steeri
In energy balance of buildings the ventilation losses are a big part, and this part is getting relatively bigger the better the enclosure of the building is insulated. All ventilation that is larger than what is wanted for hygiene and comfort can be regarded as undesired and thus be considered as heat loss. For energy conservation it is therefore essential that ventilation rate can be controlled. This report discusses the current research in Sweden dealing with air infiltration.
Many aspects of window performance cannot be adequately predicted from basic principles, hence a number of standard tests are evolving for evaluation of some of the primary ones. The tests are widely used in product standards, along with