High Efficiency Particulate Air (HEPA) & Ultra Low Particulate Air (ULPA) Filters
High Efficiency Particulate Air (HEPA) filters and Ultra Low Particulate Air (ULPA) filters are made of a spun-hooked glass fibre, rolled into a paper-like material, which is then pleated, increasing the filter’s surface area. FILT AIR’s HEPA and ULPA filters comply with various standards from organizations such as the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE), the American Institute of Architects (AIA), and the Joint Commission for the Accreditation of Healthcare Organizations (JCAHO).
HEPA and ULPA filters screen particles larger than 0.3 µm and FILT AIR’s HEPA filters are 99.99% efficient in removing 0.3 µm and larger particles. FILT AIR’s ULPA filters are 99.9995% efficient in removing particles that are 0.12 µm and larger. When these high efficiency filters are used with a prefilter, they can last for several years in a cleanroom environment. In addition to this, because airflow capacity will decrease and the static pressure will increase with time, FILT AIR’s HEPA filters and ULPA filters have the ability to become even more efficient as the filter loads.
HEPA and ULPA filters are used widely in air filtration and purification systems to control airborne particulate levels and to stop the spread of toxic agents or infectious diseases. FILT AIR’s HEPA filters are often used in HVAC systems, biological safety cabinets (such as the Bio Safe), laminar flow hoods, and various healthcare facilities worldwide. Laminar flow hoods are not designed to control infectious diseases or toxins, but medical facilities such as isolation rooms (the IsoArk™), Intensive Care Units (ICU’s), and surgical centres / operating rooms also use HEPA filters and ULPA filters to remove infection and contamination by airborne microorganisms such as viruses, moulds, and spores.
Specially designed for use in cleanrooms and precision assembly areas, FILT AIR’s HEPA and ULPA filters come in a wide range of sizes for many applications. They can also be used in final-filtration applications with purification filters. The filtration medium consists of highly efficient microporous polyurethane minipleats that are held in place with rigid plastic separators that keep the filter medium from nesting together. The design channels the air flow with optimal efficiency and reduces resistance. The filter is sealed into a sturdy aluminium frame with a fire-retardant adhesive.
There are several important provisions to consider when looking for HEPA filters and ULPA filters, including: porosity, efficiency, filter length, height and width or ring size, and ply. Filter porosity is measured by the average number of pores-per-linear-inch (ppi), which provides an open cell that offers little air restriction to fine-celled foam for maximum particulate filtration. Efficiency is the ability of HEPA filters and ULPA filters to remove a certain amount of particles of a certain size with a specific airflow. Ply refers to the layers of media that are contained in the filter. The filter’s ply can be anywhere from one to five, and in special circumstances even greater than five.
All of FILT AIR’s HEPA filters are tested for air flow resistance and DOP (dioctylphthalate) smoke penetration with a mean particle diameter of 0.3 microns by measuring upstream and downstream concentrations with a laser, achieving the rating of 99.99% efficiency with particles 0.3 microns or larger in diameter.
Since different processes of air filtration and purification need different levels of air cleansing and purification, at FILT AIR we help to analyze and specify your requirements, producing a match for your specific needs and FILT AIR Ltd. has developed a complete range of high efficiency filtration solutions.