A good air purifier can purify most harmful particles in the air to a certain extent, and can indeed achieve the effect of clean air. However, when choosing an air purifier, it is important to first understand the selection criteria for air purifiers. Firstly, whether an air purifier is good or bad depends mainly on the output ratio of clean air. The higher the output ratio, the better the purification effect will naturally be.

What are the considerations when choosing an air purifier?

(1) Purification technology

We should choose air purifiers that use three major types of technologies: physical filtration, chemical decomposition filtration, and ion technology. Physical filtration technology is the preferred choice, and to ensure purification effectiveness, we should try to choose air purifiers that use multiple purification technologies; Avoid choosing air purifiers that use electrostatic dust collection technology.

(2) Filter material

The purification effect varies greatly depending on the material of different filters. The higher the HEPA filter level, the smaller the particle diameter that can be filtered, and the better the filtering effect. At present, HEPA filters made of antimicrobial peptide materials have a very high purification efficiency.

(3) Air cleanliness level

The larger the CADR of an air purifier, the larger the purification area and the more purification cycles it has. The international standard is 5 cycles per hour. When choosing, consider whether the clean area of the air purifier matches the room area, and try to choose an air purifier with a high air purification capacity.

(4) Purification efficiency

The one-time purification efficiency of the product=(number of particles at the inlet - number of particles at the outlet)/number of particles at the inlet. The one-time purification effect can intuitively show the quality and purification effect of the product. Consumers should consider not only the one-time purification efficiency but also the overall purification efficiency, that is, the air cleanliness, when making a purchase.

(5) Real time display of PM2.5 values

Some air purifiers on the market cannot display the PM2.5 content in the air, while others can roughly display it as "excellent, good, medium, or poor". There are very few high-end air purifiers that can display the precise value of PM2.5 in the air in real time, allowing users to intuitively see changes in indoor air quality.

(6) Body structure

At present, the inlet and outlet methods of air purifiers are mainly divided into:

1. Rear air intake and front air exhaust: This method can easily blow up dust on the floor and increase the dust in the indoor air;

2. Inlet air from below or behind and outlet air from above: This method can suck the dust on the floor into the air purifier for purification and blow out fresh air from above, playing a role in "cleaning the floor".

(7) Safety and prevention of secondary pollution

The use of electrostatic precipitators and pure negative ion technology in air purifiers can generate ozone, which is commonly known as the secondary pollution problem of air purifiers. A certain amount of ozone can kill bacteria, viruses, and decompose gaseous pollutants, but excessive ozone is harmful to the body, affecting the lungs and leading to asthma. In severe cases, it can even cause cancer. At present, the safest and most efficient technologies are HEPA filter technology and activated carbon technology. Both electrostatic precipitator and pure ion technology can produce ozone. When choosing an air purifier, HEPA filter and activated carbon technology should be used.

(8) Noise issue

Noise issue is a common problem encountered during the use of air purifiers. When choosing, the noise issue should be mainly considered from the following three aspects: whether the sleep mode can truly achieve ultra quiet; Can the noise generated at maximum airflow be tolerated; Is the noise acceptable in automatic mode. Some purifiers use DC brushless ultra quiet motors and additional silent cotton technology, which can effectively reduce noise.