HEPA Filter

The HEPA filter is a critical filtration component used within the Aeration Unit (Blower/Filter) system to ensure clean air output. It captures microscopic contaminants, dust, pollen, mold spores, and other airborne particles, maintaining air quality standards in industrial environments. The filter operates through a combination of interception, impaction, and diffusion mechanisms. As air flows through the dense fibrous media, particles are trapped when they collide with fibers (impaction), are intercepted by fibers while following air streamlines, or through Brownian motion (diffusion) for ultrafine particles. The filter media is typically made of glass fiber or polypropylene, with an aluminum frame. Key parameters include filtration efficiency of at least 99.97% at 0.3 μm MPPS, rated airflow from 500 to 5000 m³/h, initial pressure drop of ≤250 Pa at rated airflow, maximum operating temperature of 80°C, and maximum operating humidity of 100% RH (non-condensing). Frame materials can be galvanized steel, stainless steel, or aluminum; media materials include fiberglass or PTFE membrane; sealant is polyurethane; gasket materials are EPDM or silicone. Standard filter depths range from 69 to 292 mm, widths from 305 to 915 mm, heights from 305 to 915 mm, and weight from 5 to 30 kg. These values are reference ranges and must be confirmed for the specific model and application. The filter is designed for continuous operation and is suitable for industrial environments where air quality is critical. When selecting a HEPA filter, verify the required filtration efficiency, airflow, pressure drop, and dimensional constraints. Confirm compatibility with the system's operating temperature and humidity. Check the frame and media materials for chemical compatibility with the environment. Ensure the filter meets relevant standards such as ISO 29463. Always consult the legal manufacturer or supplier to verify model-specific values and standards.

HEPA filters operate through a combination of interception, impaction, and diffusion mechanisms. As air flows through the dense fibrous media, particles are trapped when they collide with fibers (impaction), are intercepted by fibers while following air streamlines, or through Brownian motion (diffusion) for ultrafine particles. The filter media is designed to capture particles of various sizes, with the most penetrating particle size (MPPS) typically around 0.3 microns. The efficiency is at least 99.97% at this size, ensuring high air purity.