air quality - EU EN standard 1822 vs US HEPA filters - Engineering Stack Exchange
EN1822
H13, H12) Standard Air Flow HEPA Filter Mini Pleat Panel Type for Clean Rooms 99.999% 99.99% 99.97 at 0.3 Micron - China Air Filter and Air Cleaner
Sanitary Hepa Filter (en 1822:1998) For Multi-cyclone Vacuum Cleaner Karcher Vc 3, 2.863-238.0 Consumables For Vacuum Cleaners,filter For Vacuum Cleaners High Efficiency Filter For Vacuum Cleaners With Aquafilter - Vacuum Cleaner Parts