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Suitable area is an important index when selecting air cleaners. The suitable area's models in corresponding standards in American, Canada and Japan are all set up according to the particulate matters concentration equation. The suitable area can be calculated by multiplying a coefficient with CADR. However, air cleaners are also used to remove indoor gaseous chemical contaminants. The suitable area for particulate matters may not be reasonable for gaseous chemical contaminants. A new model to calculate the suitable area for indoor gaseous chemical contaminants has been set up. Using the CADRs of six tested air cleaners on the market, we compared the suitable areas of the air cleaners in different contaminant concentration levels. The results show suitable areas for gaseous chemical contaminants are much smaller than those for particulate matters. It is of great importance to distinguish suitable areas for different contaminants and the new model has a great reference value.

Ozone as a major ambient gas pollutant needs to be removed for many indoor environments due to its adverse health effect. The objective of this study is to investigate the ozone removal performance of a Hopcalite catalyst CuO/MnO2 under different operation conditions. The effect of relative humidity (15-80%), temperature (30-160°C) and ozone concentration (200-2000ppb) was experimentally tested. Then the catalyst was coated on fiberglass media for application. The influence of preparation method was also investigated. Finally, the application analysis of such material is discussed for building environment control situation.