24 صفحه pdf
BS EN 1822:2009
High efficiency air filters (EPA, HEPA and ULPA)
Part 1: Classification, performance testing, marking
BS EN 1822-1:2009-High efficiency air filters (EPA, HEPA and ULPA)
24 صفحه pdf
BS EN 1822:2009
High efficiency air filters (EPA, HEPA and ULPA)
Part 1: Classification, performance testing, marking