HEPA filter

High-efficiency particulate air filter; removes at least 99.95–99.97% of particles at the most penetrating particle size, depending on the standard used, such as EN 1822 or IEST. HEPA filters supply clean air to cleanrooms, LAF units, biosafety cabinets and isolators. Their integrity is tested after installation and periodically, typically every 6 or 12 months, by challenging them with an aerosol and scanning the downstream face for leaks.