1. How is electronic air purifier different from HEPA air purifier?

Air purifiers can be divided into two categories based on their working principle: electrostatic precipitator and filtration with HEPA filter. The former uses single-stage or two-stage electrostatic precipitator to captures particulate matters from the air, while the latter uses HEPA filter to remove particulate pollutants.

Particles captured by electrostatic precipitator can be removed with hair brush or water. The electrostatic precipitator thus is designed for repeated use without the cost of consumables. The high-voltage electrostatic field in the device can kill captured microorganisms and remove tiny particulate matters with the size of 0.3μm or smaller. However, electronic air purifier produces a small amount of ozone, which may affects people who are sensitive to ozone. Therefore, this type of air purifiers is most suitable for large and spacious places.

HEPA air purifier uses disposable filter to remove pollutants. HEPA filter can remove particulate matters of 0.3μm or bigger in size, and the filter needs to be periodically replaced to ensure its proper function. Because HEPA filter itself cannot kill the absorbed microorganisms, it is recommended to select a HEPA air purifier equipped with ultraviolet lamp for disinfection. HEPA air purifier is suitable for households and other small spaces.

2. How do we determine the air purifier's effective area?

The effective area of an indoor space is generally determined by comparing the maximum air flowing rate and the total volume of the indoor space (In cubic meters), and calculating the number of cleaning cycles (Theoretical passing of the entire volume of air) within one hour. However, in reality, the effectiveness of an air purifier can be influenced by many factors, such as constant redistributions of pollutants in the defined space, the purifier's particle-removing efficiency, and the length of operating time. We suggest that users should use the provided data of effective area as a reference when selecting an air purifier for their particular use.

3. Can I open the window for ventilation while the air purifier is being used?

Air purifier generally functions by circulating indoor air through its cleaning mechanism to remove pollutants. This process is not affected by the opening or closing of windows. Although its purification efficiency is not affected, window opening allows outside particulate matters to continuously enter the room. Considering this factor, we suggest to keep the window closed in order to keep indoor air clean while air purification unit is operating.

4. Why does the air purifier sometimes stink?

Bad smell is usually caused by accumulated dust in the air filters, including the electronic cell. Cleaning the electronic cell or replace the HEPA filter will solve the problem.

5. Can the electornic cell kill P. aeruginosa or Staphylococcus?

The electronic cell captures flying dust (particulate matters) through high voltage direct current. Microorganisms including bacteria, viruses and fungi adhere to dust and float in the air. When these microorganisms enter the strong electrostatic field, they are immediately inactivated by ionization. The disinfection process is effective regardless of microorganism categories or biological characteristics. Therefore, all microorganisms including pathogenic P. aeruginosa and Staphylococcus can be killed.

6. Is air purifier different from air sterilizer?

Yes, they are different. Air purifier is designed to reduce small particulate matters and harmful chemicals in the air and make indoor air fresher. Air sterilizer is designed to only kill microorganisms in air with ultraviolet light but unable to remove pollutants from the air. Air sterilizers are generally used in medical systems.

7. Can negative ion generator be used as air purifier?

No, it cannot. There are many large, medium or small-sized negative ion generators on the market. Ions discharged into air cling to floating dust in air and particulate matters tend to settle on the ground. Without being removed from the environments, these particulate matters are easily re-suspended back in air. The negative ion generators thus cannot work as air purifiers.

8. Is there any air purifier without fan?

All air purifiers require air to pass through their purification mechanisms. Without a fan system to generate enough air flow, the air purifier will not work efficiently remove harmful pollutants or microorganisms from a closed environment. Scientifically speaking, it is unfeasible to produce a fan-less air purifier that is able to achieve meaningful air purification.