Cn95 certified car can prevent new crown virus?
Misleading, car air conditioning filter and mask have no comparability
Chen Xiaokai, associate professor, School of machinery and vehicle, Beijing University of Technology
The novel coronavirus pneumonia has been the main product of N95. The recently approved CN95 filter of automotive air conditioner filters has been approved by a domestic certification authority, which indicates that the efficiency of particulate filtration with diameter of 0.3 microns is over 95%, which can effectively filter the new crown virus. Some car companies will pass the certification as the selling point of new model promotion has become a hot topic.
The introduction of cn95 certification rules is of great significance for standardizing the filtration efficiency of automotive air conditioning filters, promoting the improvement of air filtration technology in the industry, and providing consumers with higher quality automotive air purification systems. However, it is worth noting that some automobile enterprises equate the cn95 certified air filter with the N95 (kn95) mask, and even claim that its in car protection level is higher than the N95 mask effect, which may mislead consumers.
There are significant differences in the characteristics, use attributes and product standards of the two products, which are not comparable. From the perspective of product use attributes, the key to wearing the mask is to closely fit the face, i.e. no air leakage; however, the use of the car has its particularity, and there must be actions such as opening and closing the door and window during the use of the car, which will greatly change the tightness of the car. Besides the air-conditioning inlet, the virus may enter the car through the gap between the door and the windshield Inside. Therefore, the so-called N95 car should not be trusted to be able to prevent the new coronavirus. According to the use specification of N95 for medical use, frequent replacement is required, and the filter of vehicle system cannot be changed frequently.
Pictures in the article are from the Internet
(source: Health times)