An air purifier with a carbon filter will neutralize VOCs and formaldehyde. The one I would recommend is the one containing the most carbon pellets.

An interesting air purifier, which, in my opinion, is a better option than the Core 400S, is the new Levoit Vital 200S. It has a slightly better carbon filter and, overall, an improved filtration system.

Yes, just press the timer button until it shows zeros—that will reset it.

Hi Richard,

Thank you for your comment. I have made a comparison between the Levoit Core 300S and Core 400S, which I recommend you read.

Now, let’s return to your question. If your room is highly polluted, choosing the Core 400S, even if the room is smaller than the recommended dimensions, is an excellent choice. By doing so, you will be able to operate the device at a lower speed, achieving a similar effect to that of the Core 300S at a higher speed. Both models provide air quality data on the control panel via an LED indicator, but the Core 400S also displays PM2.5 readings.

Both models are equipped with powerful motors, with the Levoit Core 400S being significantly stronger, which is why it covers much larger rooms. Regarding noise tests, you can read my results in the individual reviews, watch the YouTube reviews, or refer to the comparison article on these air purifiers.

If you have any further questions, please don’t hesitate to ask!

Also does one have to use the App. Can one manually access the air quality sensor or only via the App?

Also I take it that the motor strengths on both the 300 and 400 are strong enough to maintain The CADR through the aHEPA filter wh usually slows down the air flow because the filter is of a somewhat concentrated mass for obvious reasons to extract the dirty dust and other offensive particles…

Thanks for you very informative website …pl advise on the above…richard grace

I used to own a blue air 411 auto and it worked great but I heard it has a ionizer ozone and does not use a True hepa and the carbon filter did not work good. And I wanted a air purifier that works with Alexa. So I bought a levoit core 400s. But it has a bad smell.

I’m also have bad side effects with ozone air purifiers.

So I’m now thinking of buying the:
Winix 5500-2 with plasmawave TURNED OFF for no ozone. | Or the Xiaomi Mi 3H. Because it’s has a Alexa feature and a display feature.

But I want an air purifier that has a pellet acivated carbon filter that removes formaldehyde and a True HEPA filter that removes bacteria and viruses.

Thank you!

Hi, thanks for your kind words.

That’s a great question. Unfortunately, the European version is slightly less powerful, about 10% less. The US version has a CADR of 260 CFM, while the EU version has a CADR of 235 CFM.

But I think that doesn’t drastically change the overall performance of the Core 400S.

Thanks.

Thanks.
Looking forward to your reply.