Testing the performance of a medical use air purifier is crucial to ensure its effectiveness in providing a clean and healthy environment, especially in medical settings where the health of patients and medical staff is of utmost importance. As a supplier of medical use air purifiers, I understand the significance of rigorous testing procedures. In this blog, I will share some key methods and metrics used to evaluate the performance of medical air purifiers.
1. Filtration Efficiency Testing
One of the primary functions of a medical air purifier is to remove harmful particles and contaminants from the air. The most common way to measure filtration efficiency is through the Minimum Efficiency Reporting Value (MERV) rating, High - Efficiency Particulate Air (HEPA) filters, and Ultra - Low Penetration Air (ULPA) filters.
MERV Rating
The MERV rating system ranges from 1 to 20, with higher numbers indicating better filtration efficiency. For medical use, air purifiers typically require a MERV rating of 13 or higher. To test the MERV rating, a standardized test is conducted in a laboratory environment. A test aerosol of a specific particle size distribution is introduced into a test chamber. The air purifier is then run, and the concentration of particles is measured before and after the air passes through the filter. The efficiency is calculated based on the reduction of particles in different size ranges.
HEPA and ULPA Filters
HEPA filters are designed to remove at least 99.97% of particles that are 0.3 microns in diameter. ULPA filters are even more efficient, removing 99.999% of particles 0.12 microns in diameter. To test these filters, a similar method to MERV testing is used. A monodisperse aerosol of the target particle size is introduced into a test rig. The filter is challenged with the aerosol, and the particle concentration upstream and downstream of the filter is measured. The difference in concentration is used to calculate the filter's efficiency.
2. Airflow Rate Testing
The airflow rate of a medical air purifier determines how quickly it can clean the air in a given space. It is measured in cubic feet per minute (CFM) or cubic meters per hour (m³/h). To test the airflow rate, a flow hood is commonly used. The flow hood is placed over the air intake or outlet of the air purifier. The device measures the volume of air passing through the hood per unit of time.
In a medical environment, a sufficient airflow rate is essential to maintain proper air circulation and reduce the risk of airborne disease transmission. For example, in a hospital waiting room, a higher airflow rate is required to quickly remove contaminants exhaled by patients.
3. Noise Level Testing
In a medical setting, patients need a quiet environment for rest and recovery. Therefore, the noise level of a medical air purifier is an important performance indicator. To test the noise level, a sound level meter is used. The air purifier is placed in a silent room, and the sound level meter is positioned at a specific distance and height from the device. The noise level is measured at different fan speeds. Most medical air purifiers are designed to operate at a noise level of less than 40 - 50 decibels on low - speed settings.
4. Negative Ion Generation Testing (if applicable)
Some medical air purifiers, such as our Negative Oxygen Ion Air Purifier and Portable Negative Ion Air Purifier, use negative ions to improve air quality. Negative ions can attach to airborne particles, making them heavier and causing them to fall out of the air.
To test negative ion generation, a negative ion counter is used. The air purifier is turned on, and the negative ion counter is placed at a specific distance from the ion emission port. The counter measures the concentration of negative ions in the air. The results are compared to the manufacturer's specifications to ensure the device is generating the appropriate amount of negative ions.
5. Biological Contaminant Reduction Testing
Medical air purifiers are often required to reduce the presence of biological contaminants such as bacteria, viruses, and mold spores. To test the effectiveness of an air purifier against biological contaminants, a bio - aerosol chamber is used. A known concentration of test microorganisms is aerosolized into the chamber. The air purifier is then operated for a specific period, after which samples of the air in the chamber are collected and analyzed. The reduction in the concentration of microorganisms is used to determine the air purifier's effectiveness.
6. Odor Removal Testing
In medical facilities, unpleasant odors can be a concern. Air purifiers equipped with activated carbon filters or other odor - removing technologies are used to address this issue. To test odor removal, a test chamber is filled with a specific odorant, such as ammonia or formaldehyde. The air purifier is turned on, and the concentration of the odorant is measured at regular intervals using a gas sensor. The reduction in odorant concentration over time indicates the air purifier's ability to remove odors.
7. Energy Consumption Testing
Energy efficiency is an important consideration, especially in large - scale medical facilities where air purifiers may be running continuously. To test energy consumption, a power meter is used to measure the electrical power consumed by the air purifier at different operating settings. The results are used to calculate the energy efficiency ratio (EER) or the annual energy consumption of the device.
8. Long - Term Performance Testing
In addition to the above - mentioned short - term tests, long - term performance testing is also necessary. This involves running the air purifier continuously for an extended period, such as several months or even a year. During this time, the filtration efficiency, airflow rate, and other performance parameters are periodically measured to assess any degradation in performance over time.
Conclusion
Testing the performance of a medical use air purifier is a comprehensive process that involves multiple aspects. As a supplier, we are committed to ensuring that our products meet the highest standards of performance and reliability. By conducting rigorous testing, we can provide medical facilities with air purifiers that effectively remove contaminants, reduce the risk of airborne diseases, and create a comfortable and healthy environment for patients and medical staff.
If you are interested in our medical air purifiers, such as the Air Purifier for Senior Wellness, and would like to discuss procurement, please feel free to contact us. We are ready to provide you with detailed product information and customized solutions to meet your specific needs.
References
- American Society of Heating, Refrigerating and Air - Conditioning Engineers (ASHRAE). (2019). Standard 52.2 - 2017: Method of Testing General Ventilation Air - Cleaning Devices for Removal Efficiency by Particle Size.
- United States Environmental Protection Agency (EPA). (2020). Air Purifiers and Cleaners.
- International Organization for Standardization (ISO). (2018). ISO 16890:2016 - Air filters for general ventilation - Determination of filtration performance.
