The performance of an air cleaner depends on the outdoor air change in the space where it serves. The results of that study reveal that when the outdoor air change rate of that space approaches the clean air delivery rate of an air cleaner, the efficiency of the air cleaner declines. Inversely, as the clean air delivery rate of an air cleaner exceeds the outdoor air change rate of the space it serves for by more than four times, the air change of that space has practically no effect on the air cleaners performance.

The objective of the present paper was to investigate the ability of activated carbon filters to protect office workers from the contaminants originally emitted outdoors. Models combining advection, sorption and diffusion in a porous medium were implemented in the Matlab/Simulink environment to simulate the dynamic behaviour of an integrated building/HVAC with activated-carbon filter system.

The overall performance of an air purifier in removing toal volatile organic compournds (TVOC) is presented in this paper. The air purifier has been connected with the air distribution system above the ceiling of the waiting area of the optometry clinic in Hong Kong polytechnic university.
The comparison between chamber test and field measurement indicates the effect of room ventilation on the effectiveness of air purifiers.

Photocatalytic oxidation (PCO) is a new approach that destroys chemically the pollutants instead of adsorbing them into a matrix. A high conversion of organic pollutants can be obtained with no production of ozone. The PCO unit disinfects the air and experimental studies indicate that a wide range of bacteria can be eliminated.

This paper reports the test results of a new photocatalytic oxidation air filter unit (PCO unit) that has been designed for aircraft cabin applications. The performances of the PCO technique have been measured in a single pass mode test rig to show its ability to decrease the amount of VOCs entering it, and in a multipass mode test rig to measure its ability to clean the air of a room polluted with the same VOCs. The results are promising but the development of that photocatalytic air filter must go on.

This paper is a sum up of the new ventilation requirements in Flemish region published in the Belgian "Moniteur" on June 17th 2005. The legal framework for the new regulation is given by the Decree on the Energy Performance and Indoor Climate, adopted by the Flemish Parliament ; the technical specifications are given in Execution Orders, approved by the Flemish Government.
There are two different sets of requirements :

In this paper, results of air leakage testing in newly constructed multi-unit residential buildings are presented, they show that individual apartments are relatively airtight. Energy use can be reduced, odor transfer between apartments can be prevented and occupant safety is enhanced during fire emergencies.

The strongest justification for lowering ventilation rates would be epidemiological studies that link ventilation and health effects in several building types. In the past 25 years, few studies addressed that question in USA. But Swedish studies that revealed that health risks increased in residences when ventilation rates were reduced could serve as a model for the epidemiological study we need. In the meantime, we must be cautious and not reduce our minimum standards for ventilation rates until the efficacy of these reductions should be demonstrated.

Ashrae 62.1 and 62.2 standards set minimum ventilation rates that provide acceptable indoor air quality (IAQ) in occupied places. But these rates contribute to building mold problems in hot, humid climates. The aim of this paper is to see if those minimum ventilation rates should be lowered in those regions, or if other options could mitigate the problem, including energy recovery ventilators, stand-alone dehumidifiers, and low sensible-heat-ratio air-conditioning equipement being developed by the industry.

This paper describes the performance of a comprehensive experimental study to evaluate the capabilities of 6 different air-cleaning devices that included either HEPA filtering or electrostatic precipitation. Five were portable and were intended to provide air cleaning for bedroom-sized rooms. The sixth was situated in front of the headboard to affect the particulate population for sleeping persons. To ensure a completely objective study, a special laboratory facility was constructed.