Primary Pre-Filters‌

Primary pre-filters serve as the first line of defense in air purification systems, primarily capturing large particles ≥5μm (such as dust, pollen, and hair) to protect downstream medium- and high-efficiency filters, extending their lifespan. Their core functions include:

• ‌Coarse Filtration‌: Made from materials like non-woven fabric, nylon mesh, or metal mesh, with filtration efficiency of 30%-90% (for 5μm particles).
• ‌System Protection‌: Reduces load on medium/high-efficiency filters, lowering maintenance costs.

‌Types & Structure‌

1. ‌By Filtration Grade‌
   • ‌G1-G4‌: European standard EN779 classification, with G4 achieving 70%-90% efficiency (5μm).
2. ‌By Filter Material‌
   • ‌Reusable‌: Metal mesh or nylon mesh (e.g., aluminum-frame pre-filters).
   • ‌Disposable‌: Non-woven fabric or synthetic fiber (e.g., flat panel pre-filters).
3. ‌By Design‌
   • ‌Flat Panel‌: Low cost, suitable for HVAC systems.
   • ‌Pleated‌: Larger filtration area, higher dust holding capacity.
   • ‌Pocket‌: Higher efficiency, ideal for pre-filtration stages.

‌Key Parameters & Selection‌

‌Installation & Maintenance‌

1. ‌Installation Notes‌
   • Match system airflow (recommended velocity: 1-3 m/s).
   • Check sealing (e.g., double-lip seal design).
2. ‌Maintenance Schedule‌
   • Commercial spaces: 3-6 months; industrial: 1-3 months.
   • Replacement criteria: Pressure drop reaches 2-3× initial resistance or visible dust accumulation.

‌Typical Applications‌

• ‌HVAC Systems‌: Pre-filtration for downstream protection.
• ‌Cleanrooms‌: Air return filtration or pre-stage for HEPA filters.
• ‌Industrial‌: Air compressor or gas turbine intake pre-filtration.

Shenzhen ZhongJian South Environment Co., Ltd was founded in 2003.

Which is the only high-tech technology company in Southern China with CNAS certification

We are mainly engaged in Designing Manufacturing, Testing & Verification, Manufacturing Processes and Quality Control, Engineering & Installation and After-Sale Service of clean room and devotes to control and treatment of air PM2.5, formaldehyde, benzene, VOC and other toxic and hazardous substances.

Our main clean room products and equipment include air filter, air shower/cargo shower room, high efficiency air outlet, FFU, AMC chemical filter.

We serve chip microelectronics, data centers, chemical laboratories, new energy, medical devices, pharmaceutical manufacturing, food and beverage, cosmetics, biotechnology, precision instruments, aerospace and other industries. The business fields involve clean room products and equipment, air micro-pollution services, clean design and installation, including household fields, commercial fields, industrial fields and animal husbandry fields.

We won good reputation in this industry. Products and services are highly acknowledged and recommended by customers, we hold strong influence and competitiveness in the market as well. With the mission of being the leading enterprise in Control and Treatment of Air Micro-Pollution, We strive for the leapfrog development of products, technologies and services in Spirit of The Pioneering, Innovative, Combatant and Progressive. We would constantly bring forth new ideas in the innovation and development with protection and sustainable China's environment.