BS EN 1822-1. High efficiency air filters (EPA, HEPA and ULPA). Part 1. Classification, performance testing, marking. Part 1: Classification, performance testing, marking— 22 стр.
High-efficiency filters and filter media for removing particles in air -- Part 2: Aerosol production, measuring equipment and particle-counting statistics— 34 стр.
High-efficiency filters and filter media for removing particles in air -- Part 4: Test method for determining leakage of filter elements-Scan method— 46 стр.
