The air contamination has become a problem in Japanese classrooms. The indoor measurement of Formaldehyde and VOC has become compulsory according to the law. A simple method of measurement the constant concentration attenuation method has been used to investigate the ventilation amount in 14 classrooms. CO2 was used as a tracer gas.
The analysis of the relations between ventilation amount and concentration of VOC is presented.

This project brought together, during a two-day meeting, six experienced IEQ investigators with decades of combined problem-solving experience in thousands of buildings. A group process gathered and synthesized their knowledge about : - the key environmental factors causing building-related symptoms in office buildings and- the key strategies for preventing these problems. Those empirical results were compared to current scientific knowledge and summarized for use in developing practical guidelines for maintaining good IEQ.

In order to evaluate the impact of potential interventions on indoor contaminant concentrations and occupant exposures, a simulation study was conducted using the multi-zone IAQ model CONTAM.This paper describes the building model and eight interventions : upgrading gas stove, operation of gas oven to heat home, removal of unvented space heater, enhanced particle air cleaner, installation of air-conditioner, kitchen and bathroom exhaust fans, mechanical whole-house ventilation, tightening the envelope.

Experimental measurements and CFD simulations were carried out to study the contaminant dispersion in a ventilated room with an area source release. A displacement ventilation system and three mixing ventilation systems using a grille, square, and slot diffuser were used. A model was validated to study the effects of airflow and the area source location on the dispersion of the contaminants. The simulation results have been compared to the experimental data, the conclusion are presented.

This paper presents an experimental study with numerical predictions of airflow and temperature characteristics. It was conducted in a full size experimental room with different supply jet conditions, heat densities and air distribution methods including the FR (floor return) and the TR (top return) air distribution configuration.

The aim of this paper was to study the effect of duct cleaning on the perceived air quality. Duct cleaning was carried out in 10 non-problem Finnish office buildings between 1997 and 2000. Before and after the cleaning, concentrations of particle mass, viable fungal spores and bacteria, TVOC and CO2 were measured in outdoor, indoor and supply air every 6 months. In parallel, a questionnaire about their feeling, was distributed to employees before and after the cleaning.

This paper considers regulations and standards and compare them about their requirements in ventilation flow rates and IAQ. They can be a helpful tool to handle these requirements and to create buildings with a quality level which satisfies the needs of the users
Scandinavian countries are quite similar in respect of culture, building tradition, climate and so on. So, the difference in ventilation requirements between them should be expected to be small but the results of their comparison show a wide difference.

Few studies have addressed the issue of how to make improvements to avoid Taiwanese housewives exposing to excessive quantities of air pollutants when cooking. This study investigated the design and experimental assessment of side exhaust systems in afull-scale model kitchen including exhaust equipment and the measuring apparatus. The aim was to understand how different exhaust configurations could affect the overall exhaust performance.

A well adjusted ventilation is useful to save heating energy with regard to hygienic aspects or aspects of building materials maintenance.For that study, a simple device was developed with the VVGD, it aims at helping housing users to perform a sensible ventilation behavior based on reliable sensor data. During the field test, a total of 35 VVGDs were installed with 19 test users.The sensors output their signals to a display unit similar to a traffic light.

In this emergency ventilation investigation, the aim of ventilation is to minimize the influence of contaminative gas upon the occupants.A two-dimensional Cellular Automata model is used to calculate the occupants developing distribution during an emergency event. With the numerical simulation tool, the negative influence on every person has been calculated.