Adam Wong

@adreamofpassion @ukhadds It doesn't make much difference in this case.

Question for infection control/aerosol specialists: in a shared hospital room (2 cribs, no curtains, unmasked staff in/out), where is the best placement for a HEPA air purifier for a baby: near the crib? between the two cribs? elevated vs floor? @ukhadds @Engineer_Wong

@YKamenin Yes.

@Engineer_Wong Is that because of electrostatic effects, so it's not just a simple sieve with a particle size cutoff?

Recently, I've received several emails requesting H13 or even higher-grade filters. I would still like to explain here why H13 and higher-grade filters are not a good choice for air purifiers. A good air purifier's primary goal is to clean the air in a room as quickly as possible. There is a specific metric to describe this: CADR (Clean Air Delivery Rate). The higher the CADR, the faster the purifier captures airborne particles on the filter. Achieving a high CADR requires two conditions: High filtration efficiency – the filter should capture a high percentage of particles that pass through it. Large airflow volume – a large amount of air should flow through the filter per unit of time. If the airflow is large but the filtration efficiency is low, only a few particles are captured each pass. Conversely, if the efficiency is high but the airflow is small, the total number of captured particles is also low. But these two factors contradict each other. With the same fan, using a higher-grade filter improves efficiency, but it also increases resistance, which reduces the airflow. So a higher-grade filter is not always better. Filters like H13 or H14 commonly found on the market have very high resistance, significantly reducing airflow and thereby lowering CADR — meaning slower purification. After extensive testing, I found that the E11 filter offers the best balance. With about 95% filtration efficiency, its airflow loss is minimal, resulting in the highest overall CADR and thus the fastest cleaning speed.

@YKamenin No. Everytime it is the radom 5%. So for two times it is 0.25%.

@Engineer_Wong Is it 95% with each pass, or is it mostly the same 95% that would be filtered, so the remainder would always escape?

@VeronicaAthie @BeAirAware No. Merv13 is even lower than E10.

@Engineer_Wong @BeAirAware Thanks Adam! Does H13 equals MERV13?

@jayrtfm Laminar flow device is different. It is important to use high grade HEPA filter in laminar flow device.

@Engineer_Wong In the scenario where we are directly unmasked breathing in the airflow, like with the 4Lite, wouldn't 99.9% filtration be most important?

@EricLDaugh Republicans think giving a ticket for illegal parking is communism. Fox News shouldn't have been allowed to come into China with Trump. You are NOT welcomed.

🚨 The Chinese Communists have just TICKETED the Fox News crew, using their abundance of surveillance cameras placed around Beijing! BRET BAIER: "There are literally cameras everywhere...they see everything...our driver parked illegally for 2 MINUTES and got a ticket for $40!" "Because they saw it, on the camera." This is Communism! It's what the Democrats want.

If you want to know how many Chinese wear masks, this is a perfect clip.

@jillneimark I just checked but didn't receive your email since Feb.

@Engineer_Wong Hey, I wrote you on email that I can’t seem to charge one of my air Fanta lite. Can you answer me and troubleshoot thx.

Physical measures that can protect against COVID-19, including masks, air purifiers, and ultraviolet sterilizers, can also protect against the hantavirus. This is different from biological protection measures, such as vaccines. Therefore, the most effective way to deal with a new virus is still physical protection.

@Claireissimo Please send an email to airfanta@air-fanta. I am happy to provide a bundle offer to you.

@Engineer_Wong Hi Adam, Just wondering you you ever do bundle offers? Am hoping to get a 4lite, & a Wear at some stage. Thank you. Keep going! X

The replacement filters are now in stock on our website for European customers. I sincerely apologize for the long wait. That said, the shipping and receiving process for this batch took 3.5 months, which is far longer than it should have been.

@letsblamerussia all the EV cars are equipment with AutoDrive. So it definitely collect data. But I am sure the data will be stored in the US locally, based on the US law, just like what TikTok is doing.

@Engineer_Wong Can we have an EV w/o all the data collection and connectivity?

Trump is about to arrive here. According to rumors, the cooperation between the two sides may include allowing Chinese auto companies to invest in building factories in the United States to produce a new generation of electric vehicles. I really hope this can come true. I own an electric vehicle myself, and whether in terms of cost, driving experience, or environmental friendliness, an EV is simply unmatched by any internal combustion engine vehicle. Electric vehicles can significantly reduce carbon dioxide emissions and help mitigate the greenhouse effect. China and the United States, as the world's two largest economies, actually have enormous potential for cooperation—potential that can benefit both countries and all of humanity. The only thing we need to set aside is the prejudice born of geopolitics.

@1goodtern This is a very good one.

The difference is: People who are concerned about the danger of Hantavirus want to be wrong, and take action to ensure they are. People who are not concerned about the danger of Hantavirus want to be right, and take action that ensures they're wrong.

@TinaTs2 This is the G2.

@Engineer_Wong Hi Adam! Is this the new monitor that you are launching? Do you know when it will be available? Unfortunately the previous one I bought has stopped making any noises due to a fall and sometimes does not measure PM 2.5. So I was thinking of buying your new one.

This is the air quality in my office. And meanwhile, outside the PM2.5 is 40 micron gram per cubic meter.

@Happy_live_safe @Michaeltikus @DrMLivingston 3Pro filters need to be changed when completely black.

@Engineer_Wong @Michaeltikus @DrMLivingston I Vacuum the outside of the 3pros every few weeks and get a lot of the large particles out (like lint on the clothes dryer). I do wonder if I can visualy determine it's time to change the filters.

Found my daughters @Engineer_Wong Airfanta She took this to school and it came time to change the filter. 🤮

Just me and my #Airfanta on a Friday Night traveling.

@Michaeltikus @DrMLivingston It needs to be changed when the filter turns grey. When dust has already accumulated into piles, it's too late.

@Engineer_Wong @DrMLivingston How can you time filter change perfectly?

Unfortunately, Amazon does not allow sellers to respond to or explain reviews, so I have no way to refute this seemingly professional comment on the platform. The vane anemometer he used, which costs a few dozen dollars, has a minimum measurement range — generally, it cannot detect airflow below 0.5 m/s. This is because the vane requires a minimum force to turn. However, laminar flow velocity is typically below 0.5 m/s and cannot drive the vane to rotate, so the measured velocity reads zero. Excessive wind speeds would not be laminar flow. Therefore, he used a completely unsuitable device to measure the airflow and reached a false conclusion.

@Engineer_Wong can you explain?