Can automobile air conditioner really achieve N99 protection? Experts say "bullshit"!

Can cars really prevent viruses? When I first saw the posters of Roewe and MG, I thought I saw them? "Shuanghuanglian which can restrain novel coronavirus" has come to collect IQ tax again.

Of course, we are not experts, and we dare not talk nonsense. So we first consulted the relevant experts of 3M and ManHummer-3M not only has masks, but also is a world-famous brand of automobile air conditioning filter. ManHummer may not be as famous as 3M among car owners, but he is a leader in the automobile filter industry-let's just say that if the whole automobile filter industry is compared to the mobile phone industry, ManHummer is either Apple or Samsung.

As a result, 3M's reply to this question is "no comment"-later we learned that 3M is the supplier of air conditioning filter for SAIC MG/ Roewe; Manhumer's reply boils down to two words-"nonsense", and the following passage is attached by the way.

You can guess the attitude of the experts yourself. What I see from it is well-meaning advice, "Don't take rhythm, don't mislead consumers".

In this sensitive period, a bottle of Shuanghuanglian can make people crazy, what's more, anti-epidemic keywords such as "N95", "N99" and "medical grade" will make consumers' nerves beat violently. Many people will associate them with N95/N99 masks, and then think that these cars can also prevent this kind of novel coronavirus?

But this is not the case. First of all, the poster said that "the sterilization rate is above 99%" and "the filtration efficiency of virus carrier droplet nucleus is above 95%", so it was determined that it reached the protection levels of N99 and N95.

However, we know that vehicle filters and masks are different products with different uses and product standards, so they cannot be applied. At present, the filtering technology of many enterprises is aimed at 0.3um? The filtration efficiency of sodium chloride aerosol can reach 95% or even higher, but it cannot be considered as N95 mask level.

Moreover, we don't know whether the data mentioned in the poster has been certified by a third-party testing organization, but Manhumer clearly told AutoLab, "As far as we know, there is no product in the (air-conditioning filter) industry that has effectively tested the filtering effect of novel coronavirus, and we will not deliberately guide any consumption rhythm until we get any laboratory results."

How to interpret this sentence? Quite simply, all air-conditioning filters of car companies are purchased by OE and provided by companies such as Manhumer, Mahler and 3M. If no product in the whole industry can effectively test the filtering effect of novel coronavirus, where does the anti-virus data of "N99/N95" come from? Is it difficult for car companies to develop their own filters? This is obviously unreasonable. As one of the leading enterprises in the industry, 3M certainly knows this conclusion. As an air-conditioning filter supplier of SAIC MG/ Roewe, if it openly opposes customers' misconduct and supports customers, it will be regarded as a joke in the industry, so it can only choose "no comment". In the final analysis, it is three words "you know" ...

At this juncture, a third-party testing organization-Huacheng Certification (affiliated to China Automobile Research Institute) appeared "timely" on the Internet, and the first domestic car "N95" appeared? Mask-level certification-CN95 standard, and pointed out in a report that choosing their certified "CN95" air conditioning filter can effectively filter bacteria, viruses and allergens, and can also effectively isolate novel coronavirus.

▲ Comparative test data of three filters of a testing organization.

However, he was soon hit in the face. A drafting unit of the Technical Specification for Automotive Air-conditioning Filters-Kedebao issued an open letter saying: We will not recognize this organization's automobile "mask" N95? N90 certification is not the standard of automobile industry, nor the group standard of filter committee of China Automobile Association, but the standard of testing organization's own enterprise. ...

This is your own YY standard. Is it beautiful or not?

Moreover, this testing process is also very difficult. For example, the detection medium used in this certification process is aerodynamic diameter (aerodynamic? The diameter (Dp) of A2 mineral dust is 0.3um, and the filtration efficiency reaches 95%? It is said that N95 protection level has been reached.

But? "N95 mask" refers to the measurement of electromigration diameter (electron? Mobility? The filtration efficiency of sodium chloride aerosol particles with a diameter (Dm) of 0.3um reaches 95%.

Obviously, CN95 certification is stealing concepts, so if the conclusion in the poster that "the nuclear filtration efficiency of virus carriers is over 95%" is based on this test data, it is really a bit nonsense.

The test shows that the filtration rate of mineral dust particles with Dp of 0.3um is 95%, but the filtration rate of sodium chloride aerosol particles with Dm of 0.3um is only 7 1%, which is far from the level of N95 mask.

Therefore, we suggest that you consume rationally and don't hope that car air conditioners can prevent viruses. I remember in the last article, we also discussed how effective car air conditioning is in virus protection. As far as mass-produced cars are concerned, the virus droplets you bring in when you open the window and open the door are definitely more than those inhaled by the air conditioner. Even if the filter can really reach the N99 mask protection level, it is of little significance for virus prevention.

Of course, we don't want to criticize the development of new technologies. If ordinary vehicles can meet the sealing and positive pressure conditions of military-grade vehicles in the future, it will be very useful to develop N95-grade filters, such as isolating external pollution and purifying the air inside the vehicle, and automobile air conditioning filters will be of great use.

Good technology is used to benefit mankind, not to fool consumers with marketing rhythm. ...

This article comes from car home, the author of the car manufacturer, and does not represent car home's position.