An Introduction to Air Filters for High-Speed Rail Stations

2025-08-24 20:19:14

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“ High-speed rail stations are enclosed, high-traffic spaces, so their air filters must handle large air volumes and multiple pollutants. A multi-stage filtration system helps maintain indoor air quality and stable HVAC operation. ”

High-speed rail stations are enclosed spaces with dense crowds and heavy passenger traffic. Their air filters must therefore handle high airflow rates and multiple types of pollutants. A multi-stage filtration system is needed to maintain air quality and stable system operation.

Core Requirements

High-efficiency purification: Capture PM2.5, dust, respiratory droplets, and other contaminants to control indoor pollutant concentrations.

Low resistance and long service life: Initial resistance should be no more than 100 Pa. High dust-holding capacity helps reduce replacement frequency, which is typically once every 3–6 months.

Stable and durable performance: The filter must withstand fluctuations in temperature and humidity, and its media should resist moisture and mold growth.

Common Filter Types and Grades

Pre-Filters

Function: Capture large particles of 5 μm or larger, including dust and hair, to protect downstream equipment.

Grade: GB/T C3–C4 (efficiency of at least 40%–50%), with initial resistance of no more than 50 Pa.

Filter media: Nonwoven fabric or washable metal mesh, in panel, pleated, or bag configurations.

Medium-Efficiency Filters

Function: Provide the main filtration stage for particles of 1 μm or larger, including PM2.5 and pollen, to control air quality.

Grade: GB/T Z2–Z3 (40%–70% efficiency) or ASHRAE MERV 8–11, with initial resistance of no more than 80 Pa.

Filter media: Polyester fiber, usually in a bag configuration that offers high dust-holding capacity and accommodates high airflow rates.

Medium-High-Efficiency Filters for Key Areas

Function: Provide enhanced air purification in nursing rooms, VIP areas, and other priority spaces by capturing fine particles of 0.5 μm or larger.

Grade: GB/T GZ (70%–95% efficiency) or ASHRAE MERV 12–13, with initial resistance of no more than 100 Pa.

Filter media: Ultrafine glass fiber in a tightly pleated design that reduces leakage.

Supplementary Filtration

Activated-carbon filters: Adsorb volatile organic compounds (VOCs) and odors.

Antimicrobial filters: Inhibit mold growth in humid regions; silver-ion coatings are one example.

Standards and Maintenance

Compliance requirements: Filters should meet the efficiency requirements of GB/T 14295. The filter media should be flame-retardant to GB 8624 Class B1, and the total bacterial count should be maintained at no more than 400 CFU/m³ in accordance with GB 9672.

Maintenance: Use a differential-pressure gauge to monitor resistance and replace the filter when resistance exceeds twice its initial value. Adjust the replacement schedule for each area, and shut down the air-handling unit during replacement to prevent contamination.

Air filtration at high-speed rail stations should follow the principles of multi-stage treatment, high efficiency, and low resistance. By balancing purification performance with operating costs, the filters help protect passenger health and maintain stable system operation.

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An Introduction to Air Filters for High-Speed Rail Stations

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