[Ra 10121 Irr Pdf Download
Virginie Fayad
A cost-effective method of controlling harmful gaseous pollutants is molecular filtration. It can be used both in outdoor air systems (also known as make-up air systems) to control pollutants and in recirculation systems to control internally generated pollutants.
All Camfil molecular filters utilise a technique known as adsorption. In simple terms, this means that the molecules adhere to materials with an extremely large surface area. Almost all Camfil molecular filters use activated carbon or activated alumina as the active ingredient. Molecular filters are sometimes also called chemical filters or gas phase filters.
ISO 10121-3 is the first classification system for molecular air filters supplying outdoor air for general ventilation systems. It contains comprehensive filter classes for the most common air pollutants in outdoor and indoor air. This facilitates the selection of the correct molecular filter, depending on the local air quality.
Ozone (O3) is formed in our atmosphere by the interaction of UV light with gases produced by various combustion processes. Ozone poses a respiratory hazard. The air quality guidelines by WHO set a maximum mean exposure concentration of 60 μg/m3 for a period of 8 hours during peak season.
Nitrogen dioxide (NO2) is formed as a direct result of combustion processes. NO2 is not only responsible for haze and acid rain, but is also harmful to our lungs, aggravating asthma symptoms and increasing susceptibility to infections. The air quality guidelines by WHO set a maximum mean annual exposure concentration of 10 μg/m3.
Most sulphur dioxide (SO2) is released from the burning of fossil fuels in power plants and industrial processes. Volcanoes are another known source of SO2. The health effects of SO2 are similar to those of O3 and NO2. The WHO air quality guidelines set a maximum daily exposure concentration of 40 μg/m3.
Toluene (C7H8) is an organic molecule used by the standard to represent the very large group of Volatile Organic Compounds (VOC). The number of sources of VOC is endless and can be found both indoors and outdoors: These include solvents, paints, building materials, combustion processes, oil and gas, etc. Due to the diversity of their chemical properties, the effects of VOC can range from an unpleasant but harmless odour to a lethal effect when inhaled or causing long-term effects such as cancer.
With the clear and easy-to-understand filter classes from ISO 10121-3, it is now quick and easy to select the right molecular air filter for a particular supply air application based on how efficient molecular filters are at removing the four gases. The selection is similar to the selection of a suitable particle filter according to ISO 16890.
Based on review of other 10121 errors it looks like updating to 2/29 should resolve the issue. I am unable to update Period 6 in the screen. It gives me a System Message 48 - Invalid date, please reenter in this form MM/DD
ISO 10121-2:2013 aims to provide an objective test method to estimate the performance of any full size gas filtration device (GPACD) for general filtration regardless of media or technique used in the device. In fact, the goal of this part of ISO 10121 is to avoid relating the test data to internal parameters altogether. The benefit with this approach is that customers of GPACDs will be able to concentrate on price/performance and suppliers will have access to a normative and objective test standard that will not require the release of proprietary information or reverse engineering of the product.
To ensure objectivity for test equipment suppliers, no specific design of the test apparatus is specified. Instead requirements of apparatus properties and validation tests are specified. However, different design examples in present use are outlined. ISO 10121-2:2013 can also be used with technologies such as scrubbers, absorbers, non-sorptive devices or packed columns as long as they fit into the test apparatus, can be meaningfully judged by the test method and are intended for general ventilation applications, both residential and non residential. Nuclear and military applications are specifically excluded.
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