A well-designed air filtration system lies at the heart of hospital cleanroom operation. It directly determines the environmental cleanliness, medical safety and infection control effect of key medical areas such as clean operating rooms and sterile wards. The engineering team…
What Is a Fan Filter Unit (FFU)? A Fan Filter Unit (FFU) is a self-contained air delivery module that combines a fan, a prefilter and a HEPA or ULPA filter in one housing. FFUs are mounted in cleanroom ceilings (or…
What Is a Gel Seal HEPA Filter? A gel seal HEPA filter (also called a fluid-seal or knife-edge filter) seals into its housing using a soft gel channel instead of a traditional flat gasket. A knife edge on the housing…
What Is a High Temperature HEPA Filter? A high temperature HEPA filter is a HEPA filter engineered to operate continuously in hot air streams — typically 250°C to 400°C — without degrading, delaminating or leaking. They are essential in industrial…
What Is an Air Prefilter? A prefilter is a coarse or medium-efficiency air filter placed upstream of a HEPA or ULPA filter. Its job is to catch large particles — dust, fibres, pollen and airborne debris — before they reach…
What Is a ULPA Filter? A ULPA (Ultra-Low Particulate Air) filter captures at least 99.9995% of particles at the most penetrating particle size — a full order of magnitude more efficient than HEPA. ULPA filters are used where absolute cleanliness…
What Is a HEPA Filter? A HEPA (High-Efficiency Particulate Air) filter is an air filter that removes at least 99.97% of airborne particles 0.3 microns (µm) in size — the most penetrating particle size (MPPS). HEPA filters are the backbone…
How Often Should You Replace HEPA Filters in a Cleanroom? “How often should I replace my HEPA filters?” is one of the first questions every cleanroom owner asks — and the honest answer is: it depends. There is no universal…