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Indoor Airborne Particle Control by HVAC Filters and Room Air Purifiers

Updated: Feb 15, 2022

Join Dr. John Zhang of 3M, a leading expert in the field for the most recent development on Indoor Airborne Particle Control by HVAC Filters and Room Air Purifiers for clean residential air.

Abstract: A comprehensive study was conducted to understand: (1) the relationship between filter efficiency and CADR (clean air delivery rate) and reduction of the PM (particulate matter) concentration in a house with a forced-air residential HVAC (Heating Ventilation air-Conditioning and Refrigeration) system; and (2) the interaction between the event room, where the PM is generated, and other rooms based on different filters and RAP (room air purifier) configurations. The study was conducted at the Emerson Helix Innovation Center in Dayton, Ohio, using its one-of-a-kind 2,000 square foot, fully functional Residential Home. The home is housed inside an environmental chamber, enabling the accurate simulation of diverse indoor and outdoor climate conditions where experiments can be conducted with an unprecedented level of precision and consistency, at a speed unachievable in a real-world setting.

This study concluded that: (1) particles can travel from the particle source space to other rooms within minutes, even with the house fan being turned off; (2) fiberglass filters showed insignificant impact on reducing PM concentration in the house, whereas high-efficiency FiltreteTM HVAC filters demonstrated excellent performance at reducing the PM concentration in the house; (3) the FiltreteTM RAP was very effective at reducing the PM concentration in a room of use; and (4) the combination of high-efficiency FiltreteTM filters and FiltreteTM room air purifiers not only provided even faster PM removal in the room of RAP use and also faster PM reduction in other rooms.


  1. Background and Objectives

  2. Methodology

  3. Test Materials and Procedures

  4. Results and Analyses

  5. Conclusions

Key Questions to Answer

•How do airborne particles migrate in a home environment?

•Are HVAC filters effective in controlling airborne particles in a home environment?

•Are room air purifiers effective in controlling airborne particles in a home environment?

•What is the interaction between HVAC and RAP?

Speaker's Bio

Dr. John Zhang has over 30 years of experience in air filtration and particle technology. He has conducted extensive research in aerosol science, filtration media, filtration systems, instrumentation for filter testing, and particle measurement. Currently, he is a Lead Specialist in 3M Company. In this position, he is responsible for developing innovative filtration technologies for residential air filtration products. Prior to joining 3M in 1992, he served as a research scientist for Thermal System Inc, where he was involved in developing filter testing equipment and aerosol measurement instrumentation. Dr. Zhang has published more than 50 technical papers related to particle technology and the filtration field. He actively participates in technical societies and standard committees such as ASHRAE and AFS.

Max. 120 free seats available


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