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Designers, professionals and practitioners are currently making evaluations and sizing ventilation systems and apparatus in Italy on the basis of the Italian standard UNI 10339. This prescriptive standard is relatively recent, being issued in June 1995.

Ventilation systems should contribute to good indoor air quality conditions and should be energy efficient. In practice, one often finds ventilation systems which often do not give the appropriate indoor climate conditions and/or which consume a lot of energy.""In an increased number of European countries, legislation exists (France, Netherlands,...) or is under preparation (Belgium, Greece,...) putting requirements on the total energy use of the building. Part of this energy use deals with ventilation (thermal energy and fan energy).

The New Zealand Building Code has kept with tradition in allowing residential building ventilationdesigns based entirely on openable window areas. Working against this tradition, however, is a trend inNew Zealand towards more airtight construction and declining reliance on open windows. Contributingto this trend are changing patterns of occupancy with fewer people at home during the working week,along with developing concerns for personal security.

Loading of ventilation components with dust may affect air handling systems performances andcontribute to poor indoor air. A lot of standardised test method for ventilation componentscharacterisation - filters, fans, heat exchangers, extract air terminal devices etc. - exist but allthese methods describe initial performance determination except for filters which are alsocharacterised by dust loading test.The aim of our study was to define a laboratory dust loading test method of extract air terminaldevices and to validate results comparing to on-site results.

A field measurement study of the airtightness of 73 - less than 5 year old - French dwellingswas led between 1999 and 2000. Buildings have been selected and classified according to theconstruction structure, the thermal insulation and the occupancy mode. Using a fandepressurizationtechnique, we assessed the air leakage rate of each dwelling with twodepressurization tests. Meanwhile quantifying air leakage rates, we observed qualitatively themost frequent locations of air leakage paths using a smoke detection method and infraredthermography.

The relationships between indoor environment and health, well being and ability to acquire knowledge are unquestionable. These are the reasons why in many countries a high level of indoor environment is required in school buildings. The goal of the paper is to compare the real state of the environment in classrooms in Poland with accepted requirements and standards. The evaluation of the existing situation is based on indoor environment measurements in 28 classrooms in Warsaw.

A Tool Kit was developed to assess indoor air quality. The Tool Kit was designed to be robust, reliable, universal and to provide data that could be linked with other studies assessing health, social factors and building conditions for any given locality. A case study using the Tool Kit to assess 116 Local Authority houses is described.

A Ventilated roof component was built and tested in the outdoor testing facilities (Test Cells) of CRES, Greece. A conventional Greek roof structure of the same area was also installed in the roof of the Test Cell allowing simultaneous measurements in order to perform a comparative study of the performance of the two parts. Different configurations in the Ventilated roof were investigated, like ventilation air gap height and application of a radiant barrier. The tests carried out under summer weather conditions will be discussed in this paper.

This paper aims to identify major characteristics of hybrid ventilation systems, whereby a clear distinction is made between ventilation for Indoor Air Quality control and ventilation as part of a strategy for control of thermal comfort in summer. The aim is to identify the major differences between the various approaches and to develop some kind of rationale. Various building projects are used as illustration for the classification.