How Do Air Filters Improve Indoor Air Cleanliness? A Key to Reducing Virus Transmission Risks

Indoor air contains a wide range of suspended particles and aerosols. Studies have shown that some viruses may attach to these particles and spread through airflow. Selecting the right air filter—such as HEPA or filters rated MERV 13 and above—can significantly reduce the concentration of particulates larger than 0.3μm, thus enhancing indoor air quality.

Understanding the Link Between Air Cleanliness and Virus Transmission

In enclosed environments like hospitals, labs, offices, and schools, air quality is closely tied to health and comfort. Viruses are extremely small but often attach to respiratory droplets or aerosols that can linger in the air. Without proper filtration, these particles may remain suspended indoors for extended periods.

Filter Grades and The Filtration Efficiency

Different air filter grades have varying efficiency in capturing particles of different sizes:

  • MERV 8: Captures particles >3.0μm, such as pollen and dust
  • MERV 13: Captures particles 1.0–3.0μm, suitable for offices and healthcare settings
  • HEPA H13–H14: Captures ≥99.97% of 0.3μm particles, ideal for ICUs, surgical rooms, and biotech labs

Where Are High-Efficiency Filters Used?

  • Hospitals: Wards, emergency rooms, isolation units
  • Labs and Biotech: Cleanrooms, animal research, medical testing
  • Office Buildings: Central HVAC systems
  • Schools and Institutions: Classrooms, kindergartens, libraries

Tips for Choosing the Right Air Filters

  • Match the filter size and thickness to your HVAC specifications
  • Evaluate air cleanliness needs to determine the appropriate MERV or HEPA level
  • Look for certifications: UL900 flame resistance, ISO16890, EN1822
  • Replace filters regularly to maintain airflow and energy efficiency

Recommended Products by Hencolin

  • HEPA Filters (H13–H14): Terminal-stage filters for critical air cleanliness
  • Medium Efficiency Bag Filters (MERV 11–13): Pre-filtration for high-dust environments
  • Primary Panel Filters (MERV 8): Ideal for offices and classrooms
  • Activated Carbon Filters: Removes VOCs and odors when used together

Clean air protects health

Air filters are the first line of defense in maintaining clean indoor air. While they cannot be claimed to “prevent disease” under advertising regulations, using high-efficiency filters is a scientifically supported step to improve hygiene and reduce exposure to airborne contaminants.

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