To assess the effectiveness of a new generation of three high volume, ceiling-mounted , high efficiency particulate air (HEPA -ultraviolet (UV) air filters (HUVAFs) for the removal or inactivation of bacterial aerosol was the aim of that study. To be tested, those filters have been installed in an indoor therapy pool building during 2 years. Materials and methods used are presented along with the results of the controlled chamber study and indoor therapy pool building studies.

The evaluation of the effectiveness of a portable high efficiency particulate air (HEPA)-filtration unit to reduce MRSA environmental surface contamination within a clinical setting, was the aim of this paper. Contamination rates have been measured at different air filtration rates (60 - 325 m3/h) and compared with no air filtration. It appears that this portable HEPA filtration unit can significantly reduce MRSA environemental contamination within patient isolation rooms and be complementary to existing MRSA infection control measures.

In USA, after the 2001 bioterrorist attack, filtration efficiencies have been evaluated at three US. Postal Service (USPS) facilities. New ventilation and filtration systems (VFSs) including HEPA filters were used to provide an optimal filtration efficiency (at least 99,97 %). In this paper the techniques used for measurement of particle concentration are described (use of optical particle counters GRIMM Type) and the results presented.

Thanks to a right air filtration strategy a good IAQ does not have to cost more. Advances in air filtration allow the development of systems that provide superior IAQ with a reduction of energy costs. HVAC filters play an important part in the removal of airborne contaminants, and protect the HVAC equipment from dust. They provide a cleaner and greener air.

Ventilation rates and main parameters related to IAQ have been tested in some office buildings and residential houses whom occupants complained about the bad indoor air quality. Based on the test results and regulations, some suggestions were made such as elimination and control of the emission of pollutants at their sources , installation of local exhaust ventilation facilities, proper design and construction of the air conditioning and ventilation systems, use of air cleaners, public education.

One strategy to secure the release of hostages held by terrorists, is to release an anaesthetic agent through the ventilation system. But it is not so easy to apply. The demand concerning the right amount of anaesthetic needed must be analyzed, along with the specific place in the building where it is required. A model has been made formulated to find the most appropriate strategy for this kind of emergency ventilation. The results are presented and recommendations given for applying the model in practice.

The aim of that study was to establish a methodology to quantify the ozone emission rate from electronic air cleaners, along with the ozone decay parameter. For that experiment 3 different portable ionisation-type air cleaners were used . The leakage rate of the stainless steel environmental chamber was measured by a tracer decay gas method. The results and conclustions are presented.

A typical office building in Honk Kong was used to study the effect of air supply temperature on the performance of displacement ventilation. That system appears to provide acceptable thermal comfort at certain air supply temperatures.

In a naturally ventilated flat, indoor and outdoor characteristics of particulate matter (PM) were studied .In that aim PM concentrations were measured in winter and summer. The results and their analysis are presented.

The most recent initiative taken by the Hong Kong SAR government to improve IAQ in various facilities is fan IAQ certification scheme for offices and public places. This paper outlines the key elements of the scheme , discusses the suitability of the IAQ criteria, and identifies the difficulties in meeting the prescribed measurement protocols.