tldr; Community favorite for helps with allergies and great for pet owners.
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Best praise vs top criticism for Levoit Core 300S
“If I were in your place there is no doubt in my mind what I would bring. One or two 3pro units by Engineer Wong (AirFanta). I own one with another on the way, and I already put the filters on subscribe and save. Very few mass-produced units will fit in a carry-on, they will all be the size and shape of the two nearly-identical units: * Levoit 300S (smoke **CADR 126 CFM** on high with 48 dB noise) - **$150** * Smartmi P1 (smoke **CADR 120 CFM** on high with 49 dB noise) - **$180** The 3Pro is four times the CADR, and as we know, [Clean Air Delivery Rate Is All That Matters! (By Joey Fox)](https://itsairborne.com/clean-air-delivery-rate-is-all-that-matters-5a5a064c211e). 3Pro by AirFanta (by [Engineer Wong](https://x.com/Engineer_Wong)) (**488 CFM**) - - **$150** It's literally as powerful as 4 of those units above, easier to pack, and costs the same. \* Photo of it in compact form from Critical Aerosol Theory: [https://x.com/criticalaerosol/status/1786642181882814810?s=46](https://x.com/criticalaerosol/status/1786642181882814810?s=46) \* “I donated a 3Pro to a doctor that I followed on social media in China.” nice anecdote just for smiles… [https://x.com/Engineer\_Wong/status/1790759071114780881](https://x.com/Engineer_Wong/status/1790759071114780881) \* Smoke demo and assembly (same video that’s on Amazon) [https://x.com/Engineer\_Wong/status/1768293482077245796](https://x.com/Engineer_Wong/status/1768293482077245796) () \* Reddit post/review: [https://www.reddit.com/r/ZeroCovidCommunity/comments/1cd24ua/](https://www.reddit.com/r/ZeroCovidCommunity/comments/1cd24ua/) **Optional Battery Discussion** The Levoit and Smartmi will make a high pitched whine if connected to a battery pack because their motors expect pure sine wave AC, and the inverters in those small battery packs are not pure sine wave. The 3Pro expects 3v to 12v DC variable and so can trivially be powered by a battery pack. I happen to own one for a different application, and it was quite hard to find - I would recommend it for this application as well: Talentcell Rechargeable 12V/8300mAh 9V/11000mAh 5V/20000mAh DC Output Lithium ion Battery Pack for LED Strip, CCTV Camera and More, Portable Li-ion Batteries with AC/DC Charger- $50 All you would need is the appropriate cable to connect from the battery’s 9V (medium speed) or 12V (high speed) barrel connector to the 3Pro’s. Or if you wanted low speed (5V) a USB to barrel connector adapter, then the cable. Let me know if you want me to test this option and let you know how it works and what cable is needed.”
“The Core 300S has a pre-filter but it is integrated into the main filter so you need to take the whole thing out to vacuum the pre-filter and it can get messy and also uncomfortable if you have allergies. If you can afford the Vital 200S, it is a big improvement on the Core 300S. I’ve used both in a small room and they both worked well at cleaning the air but the 200S makes a difference to the air faster + you will be able to use it in larger rooms if you ever need to (it gives you 5 air changes per hour in rooms as large as 375 sq. ft.)”
188 Reddit opinions analyzed • Last updated 2/24/2026