Back cleanable air filter elements for critical dust systems – US HEPA, IFA H and EN1822 HEPA

M. Wilkens*, Hengst SE, Germany

Health and safety regulations in the construction work are becoming more and more important. This trend is visible in new regulations for the occupational limit values of, for example, silicate dust systems in the last years (Occupational Safety and Health Standards 1910.1053; 2016).

State of the art filter materials for critical dust systems (HEPA and IFA H (EN60335) filter elements) are micro glass fibre based materials. The big disadvantage of this type of materials is the filter mechanism itself – depth filtration. Due to this, the lifetime of such elements is extremely low, especially if high dust loading rates prevail, like in construction work applications. A regeneration/ back cleaning of such materials is from the technical point of view not possible.

The low lifetime of this type of materials is one reason for the OSHA 126.1153 regulation, which requires for a lot of construction applications a filter element that has to be cleanable and should reach an efficiency of >99% or a HEPA efficiency of 99,97% @0,3µm (monodisperse).

The company Hengst SE as leading supplier of air filter elements for professional vacuum cleaners, which are used in such construction work applications, set oneself the target to develop a cleanable filter element with the filtration classes US HEPA, EN1822 HEPA and IFH class H (EN60335).

During this development many influencing parameters are identified, like the filter material composition and structure, the pleat pack construction and the interface of the filter element to the vacuum cleaner...

Session: G1 - Air Filtration
Day: 22 October 2019
Time: 13:00 - 14:15 h

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