This paper sums up the current results of the IAQ characteristics in 104 child care centers (CCC) , using 4 different ventilation strategies.The corresponding respiratory health symptoms of attending children with their frequency and prevalence rates are summarized too.Temperature, relative humidity and ventilation rates of naturally ventilated CCCs were consistently higher than that of air-conditioned CCCs.

In the present study, the horizontal pivot window is replaced by horizontal louvers.A numerical method (CFD) was used to simulate ventilation performance of different louvers depths as well as different wind speed. Air flow was considered, turbulent, steady, and the effects of buoyancy were taken into account. Results are presented

This paper describes some of the principles applied in the CEN standard "Criteria for the indoor environment including thermal environment, indoor air quality (ventilation), light and noise'. , and includes examples that are presented in itThe standard covers all building types but the paper focuses on office buildings, it is subject to change in so far as the international review of the draft standard is in process of writing.

Health and comfort performance criteria for buildings have been defined. Then compliance with a set of measurable parameters related to indoor air pollutants or physical characteristics of the indoor environment is expected to assure, with a high degree of confidence, the provision of acceptable performance of buildings
Energy efficiency is evaluated too by means of the energy index ( the yearly total energy use per gross heated floor area), and the building is ranked accordingly.

Air filters used in general ventilation are tested in laboratory according to EN 779 standard which has been revised in 2002.The objective of the tests described in EN 779 Annex A is to determine if the efficiency of the filter material is based on the electrostatic effects and to measure the efficiency of the filter before and after these effects have been removed. Results obtained on the occasion of a round robin test decided by EUROVENT /CECOMAF organisation has allowed to assess the discharging procedures proposed in EN 779 Annex A

A limited number of studies on the effectiveness of prevention and remediation of IAQ problems in homes were identified. This paper is a critical review of scientific literature on residential IAQ, ventilation and building-related health effects investigations.

The performance of the ventilation system in a large welding working place was evaluated for that study. The exposure to welding fumes may be dangerous for workers, to prevent that problem , jet fans were used based on concept of total space ventilation.
It was found that the welding fumes in occupied zone were not diluted efficiently when the ventilation system was not installed whereas their concentration was maintained below the regulation limiit with the jet fans,

The Danish Building Research Institute has initiated a 3-phased research programme whose aim is to develop energy-efficient ventilation strategies to provide a healthy and a comfortable indoor climate and to reduce energy consumption . In this article, the second phase of the programme is presented. Investigations were conducted in an almost full-scale apartment built inside a laboratory hall. Two out of four scenarios were investigated, one that complies with current Danish Building Regulations on ventilation, and the other with fully demand-controlled ventilation.

In this paper, an experimental setup .has been used to investigate the indoor environment in the classroom using confluent jet ventilation . Measurements of air speed, air temperature and tracer gas concentrations have been carried out for different thermal conditions along with CFD simulations to provide additional information on the indoor air quality and comfort conditions .Those results have been compared.

For that study passive tracer gas measurements of ventilation were performed in a single-family house and in a flat in Stockholm during four consecutive winter seasons The correlation between ACH and indoor-outside temperature difference is analysed for each dwelling and does not appear good enough for predictive use .The lack of good correlation between ACH and natural driving forces may be due to a highly variable influence from occupant behaviour.