We found that it’s a durable and high-quality air purifier, and its size is convenient for smaller spaces like apartments, offices or bedrooms. After using several air purifiers from other top brands, we noticed an immediate improvement to our air quality, especially concerning our allergies and lingering smoke from the fireplace. It comes with a higher price tag, but can also tackle more space than other, similarly-sized air purifiers on this list. In terms of additional functionality, the EverestAir Smart True slides side to side on caster wheels, and includes an adjustable vent fan, allowing it to be tucked under certain spaces such as kitchen counters without disrupting its efficacy. The clean air monitor display also gives a satisfying percentage reading of the air quality.
(Read more in How we picked.) And it has always delivered exceptional performance in our testing at the 0.3-micron HEPA standard, on both new and old filters. Like many air purifiers, the AP-1512HH has an ionizing function in addition to its HEPA filtration. The effectiveness of such features is dubious, and it draws additional electrical power. In 2018, in his 600-square-foot open-plan
living/dining/kitchen space, Tim tested just the large-space contenders. In these tests, which lasted for 65 minutes, he used the first five minutes to get a baseline reading of the ambient air conditions, following that with the burning of five matches and a full hour of measurements with the purifiers on. As always, Tim ran each purifier twice, once on high and once on quiet/medium.
An electrostatic air purifier uses the power of static electricity to attach air particles to the filter. You’ll then be required to clean the filter periodically to keep your purifier’s interior clean. Using new air flow advancements, Levoit air purifiers refresh the air 5x per hour in rooms as large as a 20 sqm space.
He also measured their power draw on their lowest, medium, and highest settings, using the medium setting to calculate annual power costs. In my testing, the Levoit air purifier successfully removed airborne particulates and smoky smells, but it took longer than other models I tested. That’s not really surprising since the Levoit is a fraction of the size and consumes less electrical power. The Levoit air purifier isn’t completely silent, but it was quieter than some of the other models I tested.
The machine keeps running at whatever speed you want, and you get to sleep or watch TV in a nice dark room. The AP-1512HH has also demonstrated the ability to maintain its high performance for years, even as we’ve pushed its filters far beyond their stated one-year lifespan. We ran our original test model for two years without replacing the filter, and it still performed just as well in our follow-up test as it did on day one. We ran our second test model 24/7 for four years, and again we saw no change in performance, noise output, or reliability. Air pollution from US combustion emissions alone results in 200,000 premature deaths a year, according to a 2013 MIT study.
The Levoit 400S air purifier features a HEPA H13 filter, which means it should remove at least 99.95% of airborne particles. We put it to the test with a series of trials, assessing ambient air quality before and after use of the purifier, alongside a match smoke test and an incense smoke test. For all our trials we ran the purifier at a level lower than 50 decibels (level 3) and again at its highest setting (level 4). Level 4 clocks in at around 52 decibels, which is about the same level as a normal conversation. One unique aspect that Levoit prides itself upon is that its purifiers don’t produce ozone, making them safer for you and your family. They have different powerful models to effectively clean air in rooms of all sizes, performing just as well as the more premium air purifiers on the market.