HEPA Filter Bank

A HEPA filter bank is a critical component of an Air Handling Unit (AHU) that consists of multiple HEPA (High-Efficiency Particulate Air) filters arranged in a bank configuration. Its primary role is to provide the final stage of air filtration, capturing at least 99.97% of particles 0.3 microns in diameter or larger from the airstream before conditioned air is supplied to cleanrooms, laboratories, hospitals, pharmaceutical facilities, or other controlled environments requiring ultra-clean air. The bank configuration allows for a larger total filtration area, which reduces air resistance and extends filter life compared to a single filter, while maintaining the required high-efficiency particulate removal. This product is a component intended for integration into larger systems; it is not a standalone device. The filter bank is typically housed in a rigid frame, with individual filter elements arranged in parallel to achieve the desired airflow capacity. The construction materials include glass fiber media, aluminum separators, polyurethane sealant, and a frame made of galvanized steel or aluminum. The rated airflow ranges from 1000 to 5000 m³/h, with an initial pressure drop of 150–250 Pa at rated airflow. The filtration efficiency is 99.97–99.99% for HEPA H13–H14 grades. The operating temperature range is -40 to 80°C, with brief peaks up to 100°C. The operating pressure should be between 1.0 and 1.6 MPa, and relative humidity should be kept below 95% non-condensing. The filter media grade is H13–H14 per EN 1822, and the frame material can be 304 or 316 stainless steel, depending on corrosion requirements. Seal materials are EPDM or silicone, with silicone suitable for high temperatures. Standard dimensions range from 610×610×292 mm to 1220×610×292 mm, and weight varies from 15 to 30 kg. The maximum operating pressure drop is 600–800 Pa, at which point the filter should be replaced. All values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier.

Air is forced through the dense, pleated media of the HEPA filters. Particles are captured through a combination of interception, impaction, and diffusion mechanisms. The bank configuration allows for a larger total filtration area, reducing air resistance and extending filter life compared to a single filter, while maintaining the required high-efficiency particulate removal. The filter bank is designed to operate within specified airflow and pressure parameters; exceeding these limits may reduce efficiency or damage the media. Regular monitoring of pressure drop is essential to determine when replacement is needed.