Abstract
In order to demonstrate the safety of high efficiency particulate air (HEPA) filter units from seismic phenomena, HEPA filters and HEPA filter units were shaked with sine waves and seismic waves. Acceleration responses, decontamination factor and air tightness were measured.The fundamental natural frequency of an HEPA filter was higher than 40 Hz and that of the filter unit higher than 20 Hz. The degree of amplification for filter units under seismic shaking was, therefore, nearly unity. Filter units, subjected to seismic excitations with 400 gal maximum horizontal acceleration and together with 200 gal maximum vertical acceleration, kept their performance during and after shaking tests.To estimate the seismic margin, filter units were subjected to acceleration higher than design base one, and it was found that filter units withstood to the earthquake with 4, 000 gal horizontal floor acceleration.From the results mentioned above, it was shown experimentally that the HEPA filter unit was sufficiently strong against earthquakes.
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