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Removal of ultrafine particles and particles of the most penetrating size by new intermediate class filters

Bingbing Shi (Institutionen för energi och miljö, Installationsteknik) ; Lars Ekberg (Institutionen för energi och miljö, Installationsteknik) ; Sarka Langer
Proceedings of the Indoor Air 2011 Conference, Austin, TX, USA, 6 pages (2011)
[Konferensbidrag, refereegranskat]

Twenty-three new filter samples, including three different medium types, were tested in a small scale test-rig using a Scanning Mobility Particle Sizer (SMPS). The filtration efficiencies for ultrafine particles (UFPs) and particles of the most penetrating particle size (MPPS) were determined. The filters were of class F5-F9 according to the European filter standard, which roughly corresponds to MERV9-MERV15 according to the US-standard. The filters were challenged by the indoor aerosol prevailing in the laboratory. Additional tests were made using an oil aerosol. With the indoor aerosol, charged synthetic filters showed substantially higher MPPS efficiencies than glass fiber and uncharged synthetic filters of the same class did. With the oil aerosol, the different filter media types, belonging to the same filter class, showed similar efficiencies. The oil aerosol drastically reduced, or eliminated, the electrostatic filtration mechanism. For example F7 and F8 filters not influenced by electrostatic mechanisms typically showed 40% and 50% removal of MPPS particles respectively.

Nyckelord: Intermediate class filters; UFP; MPPS; Test Aerosol; Filter Standard.

Today, standards for intermediate class filters do not consider UFPs or MPPS-sized particles. This is a major lack since UFPs have been pointed out as a potential serious health hazard. This paper provides data that enable assessment of the protection that can be expected from various filters commonly used today.

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Denna post skapades 2011-08-26. Senast ändrad 2011-08-29.
CPL Pubid: 145192


Institutioner (Chalmers)

Institutionen för energi och miljö, Installationsteknik (2005-2014)


Building Futures

Chalmers infrastruktur