Welding workshops and high-temperature production processes continuously generate suspended industrial dust. Affected by high temperature and friction, these process dust particles carry natural electric charges, bringing unique challenges to air filtration systems. In actual industrial operation, F9 pocket filters often…
A practical look at why “perfect” cleanroom filter design still runs into re-tests and non-conformances on site. In cleanroom projects, there is a very common confusion: During design, the combination of pre-filters, medium filters, sub-HEPA, HEPA, and even ULPA is…
Q: We have seen three different penetration numbers for H14 HEPA filters: 0.005%, 0.01% and 0.05%. Which one is the golden standard? This is one of the most common questions we receive from cleanroom engineers, HVAC contractors and pharmaceutical project…
In industries ranging from pharmaceuticals and biotechnology to microelectronics and aerospace, maintaining an ultra-clean environment is not merely preferable — it is a mandatory requirement. At the core of these controlled environments, known as cleanrooms, sits the HEPA (High-Efficiency Particulate…
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…