3 ms·
99.95% is the ISO (international) standard, 99.97% is the ASME (US) standard. https://www.ossila.com/pages/hepa-filter-size-chart https://www.ossila.com/pages/
by schiffern 3y ago
99.95% is the ISO (international) standard, 99.97% is the ASME (US) standard.
https://www.ossila.com/pages/hepa-filter-size-chart https://www.ossila.com/pages/hepa-filter-size-chart