Best hepa air purifiers 2018 – remove dust, pollen and smoke u gas station

Its Clean Air Delivery Rate (CADR) scores are below average compared to the other purifiers we tested, meaning it removes indoor pollutants less effectively than models like the Whirlpool Whispure and Honeywell HPA300, though it’s still capable of cleaning indoor air.

The Coway’s four-stage filtration process includes a washable pre-filter for large particles as well as a carbon filter for odors, though we found it might not remove strong odors quickly. The third stage is a HEPA filter that captures the smallest particles such as cigarette smoke and pollen. The final stage is an optional ionizer, though we don’t recommend using this feature since it can produce trace amounts of ozone, a harmful gas.

Although the Coway doesn’t have a sleep or quiet mode, its auto mode senses the air quality in the room and fine-tunes the settings. You can also set a timer to run for one, four or eight hours. At its highest setting, the Coway only produces 58 dB of sound, so you can run it while you’re home without too much noise. This machine weighs 15 pounds and is the second-lightest air purifier we tested.

This air purifier is Energy Star certified and rated to use up to 79 watts, making it one of the most energy-efficient models we reviewed. The company’s three-year warranty is shorter than that of the best air cleaners but average among air purifiers.

As we prepared for this review, we contacted the American Lung Association, the California Air Resources Board and the Association of Home Appliance Manufacturers (AHAM). We spoke with experts and read research from each of these organizations to get a good picture of whether air cleaners are useful and for advice on choosing the best one.

We also asked who benefits from cleaner indoor air. For example, we spoke with Janice Nolen, assistant vice president of national policy for the American Lung Association. She said "people with asthma or allergies, especially children and teenagers, and older adults or people with cardiovascular problems."

However, Nolen also told Top Ten Reviews that "removing the source of the pollution problem or adding ventilation [is] far more effective than plugging in a device." After taking steps to remove pollution sources and ensure good ventilation, Nolen suggests using an air purifier as a supplement to filter out airborne particles that can intensify asthma, allergy symptoms and cardiovascular conditions.

We tested 10 air purifier models from the following brands: Coway, Electrolux, Heaven Fresh, Honeywell, Idylis, Kenmore, RabbitAir, Vornado, Whirlpool and Winix. Because we don’t have a reliable way to test air purification, we used the CADR scores provided by AHAM to judge effectiveness. Instead, our in-house testing focused on noise levels and energy use.

To test the home air purifiers’ noise levels, we ran each machine at both its lowest and highest settings and measured how loud it was using a sound meter. Our tests revealed noise levels on low settings averaged around 30 dB, about the volume of a whisper. When we tested the highest settings, we found an average around 60 dB or greater, about as loud as a conversation.

Our second test tracked how much energy an air cleaner uses on its maximum settings and what sort of effect that might have on your energy bill. We found these machines are inexpensive to use daily, as the least efficient purifier only costs around $60 a year to run, or $5 a month.

Although CADR scores mostly measure purifier effectiveness, they can also tell you what room size a machine can handle. AHAM takes the smoke CADR score and multiples it by 1.55 to get an air purifier’s suggested room size.For best results, an air purifier should cover a larger room than the one you use it in. Using an air purifier in a room larger than it can handle often makes it less effective or useless.

This is how much air the purifier can clean in an hour, and it shows the machine’s airflow. The more times air passes through a machine’s filters, the more likely they are to catch previously missed dust or pollen. To illustrate this, if you use a purifier rated for 500 square feet in a room that’s 250 square feet, you essentially make two air changes every hour.

The most important filter in an air purifier is the HEPA filter, which removes 99.97 percent of 0.3-micrometer particles and must meet rigorous regulations and industry standards. Each air cleaner we tested uses HEPA filters. To prevent larger particles from reaching and blocking the HEPA filter, many air purifiers also use carbon pre-filters and other secondary filters that are easier to maintain.

Ionizers charge particles as they move through the machine so they attach more easily to a filter or any other surface, thus removing themselves from the air. Ionizers are fairly common in air purifiers but controversial, as they produce trace amounts of ozone.

Due to the risks associated with ozone, the American Lung Association does not recommend using ionizers in your home. We suggest choosing an air cleaner without an ionizer or with one that you can turn off. We did not include it in our scoring.