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Standards Development
This document establishes a classification system for GPACDs used in general ventilation systems for the treatment of indoor air in systems operating with partial or full air recirculation and affected by pollution from indoor sources.
The classification system is intended to aid in assessing molecular contamination in addition to the particulate contamination dealt with by ISO 16890-1 and molecular contamination dealt with by ISO 10121-3.
This document specifies three reference pollutants: ozone, nitrogen dioxide, and toluene that shall be used for the classification due to their relevance to the intended application. This document further specifies optional reference pollutants, including formaldehyde and isopropanol, which may be used for extended performance characterization.
This document further specifies three duty levels that are assigned for each pollutant reflecting the typical performance range of devices intended for the application.
ISO 10121-3 was successful implemented as the first classification standard for molecular filter, after it was published in 2022. This part 3 only covers outdoor air pollutant and single pass system. To further extend the molecular filtration GPACDs application, this new standard proposed to be designed to handle indoor air pollutant and including in a recirculating system. Indoor environment always being studied and growing concern.
Individual spending up to 90% of their time indoors, exposure to indoor air pollutant that link to respiratory diseases, neurological effects, and other health risk. Currently, there is no standard that classifies filters on the base of their performance for indoor air. This creates inconsistency in product performance claims and makes it difficult to design effective system to meet quality goal. On top of that, many AHU systems rely heavily on recirculating system to improve energy efficiency. It is required a clear comparison of filter performance to choose the right filter for this kind of system, where it may cause accumulating of pollutants if it is not design appropriate. This proposed standard will give a guideline to AHU designer to specify GPACD that is required to handle indoor air pollutant with a reasonable period of life.
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