New laboratory test methods using different dusts have been developed for measuring and classifying air filters but could give very misleading results compared with filter behavior in an installation. The paper describes the differences between laboratory tests and performances in atmospheric air. It provides a basis for a better understanding of air filters and filter testing to meet IAQ problems and to reflect a filters' behavior "in service".
The influence of the electrostatic forces on airborne particles have been known for centuries. These early discoveries have been summarized in several publications including the classical book "Electrostatic Precipitation" by White (1) and many others (e.g. 2, 3, 4). The utilization of the electrostatic force led to the development of electrostatic precipitator (ESP) which has been used for pollution control purposes since the beginning of this century. An excellent historical review about the development of electrostatic gas cleaning has been presented by White (1).
The INBEMI (Instituto de Beneficio de Minerales) is a Research Institute of the National University of Salta, working on the areas of mineral processing and extractive metallurgy. At present, the INBEMI is mainly working in the field of boron industry using borates as raw material. The main borate deposits in Argentina are in the northwestern provinces, near the borders with Chile and Bolivia. Among the research studies an important place is given to the industrial ventilation, including the control of the air quality that is discharged to the external atmosphere.
It is of prime importance at the design stage that the designer of an industrial ventilation system makes a reasonable assessment as to the owning and operating costs of an Industrial Ventilation System. Armed with these findings the designer must consider what improvements can be made by considering a different approach or by using other types of plant. The designer must inform the owner of the plant of any alternatives.
The owning and operating costs of a system are made up of the following items:
Standards dealing with Industrial Air Technology (IA T) are very fragmented, and a real need exists for new standards this very important field. These are required to facilitate trade and communication in this important area. Clarification of the requirements for these proposed standards is necessary before any new technical committee (TC) can be established, or before new work could be allocated to any existing TC. Since 1996, there has been little discussion about new activities, a few work items on related subjects have however commenced under existing Technical Committees.
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