Thanks for your contact. After reading your message carefully, we understand that there are 4 main questions occurring to you. To make you understand clearly, we'll answer you separately.
1.Information about AirMax8L ULTRA Filter True HEPA Filter.
Towards this type of air purifier, there are 2 kinds of filter:
1) HEPA Filter ( for particles; clearance rate reaches up to 99.97%)
2) Carbon Filter ( for odors and gases)
Among the two kinds of filters , the HEPA Filter is a 3 in 1 filter, which includes:
1) Pre-filter: is for the preliminary purification, just like a fine mesh covering on the Ultra HEPA filter. Those large particles, such as pet danger, pollen, hair, as well as the confetti, the small diameter holes make them enter impossibly.
2) H13 HEPA Filter: is designed for small particles to 0.3 mm, like dust, mold; and the purification rate reaches up to 99.97%.
3) BlueAntibacterial filter: defends various germs by blocking the food supply of bacteria making it have no chance to breed and eventually die.
And the Carbon Filter is a 2 in 1 filter, which consists of:
1) Active Carbon Filter: is perfect for terrible odors, such as household odor, wildfire smoke, etc.
2) Cold Catalyst Filter: absorbs unwanted harmful gases like formaldehyde, benzene, toluene, TVOV by conversing them into water and carbon dioxide.
If you want to get a deeper understanding and know about specific operating theory, we advise you to view the relative blog on our official website.
2.Who tests the filters? And do they meet a particular standard?
Our air purifier is safe and quality-assured, which has multiple authentications:
（1）CARB (California Air Resources Board) certified for sale in California. Approved in May 2019 and the EO number: G-19-071.
（1）CE, FCC certificated, ETL listed on 8-Nov-2018 and certification number: 180800294HZH-001.
3.What size particles are they tested with?
It's designed for both small and large particles. And those particles can be as small as 0.3 um.
4.What are the particles charged or uncharged?
Large particles like hair, pet danger, confetti; small particles like dust, mold, pollen, germs, etc.
Customers' 100% satisfaction is our goal，if you have any other needs or puzzles, please feel free to let us know.