A greater focus on health and well-being is driving sales of products like home air purifiers, with many people thinking these devices will make indoor air cleaner.Sales of these products are forecast to see a compounded annual growth rate of around 10 percent in 2015-2020, according to a 2015 report published by TechSci Research. RELATED: TRENDING LIFE & STYLE NEWS THIS HOURBut health experts say the machines are mostly unnecessary unless a person has a lung condition like asthma or chronic obstructive pulmonary disease (COPD). They advise homeowners to take other steps to clear the air before investing in one of these devices, especially since ongoing maintenance and expense are required to ensure that the units work properly.Dr. Clayton Cowl, chair of the division of preventive occupational and aerospace medicine at Mayo Clinic in Rochester, Minn., and a pulmonologist, said buyers need to understand the limitations of air purifiers."I think it's a waste of money for people who feel that sticking (one) in their home is suddenly going to rid them of all respiratory diseases.

That they'll never be ill, and that's all they need, and they're completely protected. That is not the case," he said.Patti Solano, director of lung health for the Lung Association in Greater Chicago, said air purifiers won't clean the entire home, either. Portable air purifiers, the most common, at best can improve a room. But for people who have lung conditions, investing in better filters for their furnace and buying a portable air purifier can help, Solano said. She said the best air purifiers use true high-efficiency particulate air (true HEPA) filters, which are proven to trap 99.97 percent of particles of 0.3 microns in size."We're looking at these more for patients who have asthma, COPD, anyone that might have any kind of lung disease. These do help," she said.True HEPA filters, as opposed to "HEPA-type" filters, can trap most pollens, dust and pet dander, she said. Additionally, some air purifiers have carbon filters to remove tobacco and cooking smoke.Ed Perratore, senior editor for home and appliance at Consumer Reports, said that in its tests, the best-performing air purifiers were the Honeywell HPA300 ($300, 435-square-foot room) and the Whirlpool Whispure APK1030K ($349.99, 500-square-foot room).

What to watch for. Solano said that, because there are so many different models on the market, buyers need to do their homework. She said the Environmental Protection Agency's website has a thorough review of what shoppers should consider on its Indoor Air Quality page.Perratore, Cowl and Solano said homeowners should stick to filter-type air purifiers and avoid those that use ozone to clean the air."It can act as a respiratory irritant. So it paradoxically does harm as opposed to actually helping," Cowl said.Solano said ozone is used extensively for water purification and helps decontaminate unoccupied space from certain chemicals and biological contaminants — for instance, after a fire — but she pointed out that ozone in water is not the same as ozone in air.Aside from fan speeds, Perratore said that, in its testing, Consumer Reports found there's little need to pay more for any special features on portable air purifiers.Fan speeds are important because portable air purifiers are noisy, and they're usually used in bedrooms.

However, Perratore said that, when the devices are used on low speeds, they sometimes aren't as efficient. The two top Consumer Reports picks work well on high and low speeds.Solano, Cowl and Perratore said the units work best when they're in rooms where the door is shut and are cleaned as well as possible to remove lung irritants. rabbit air purifier user manualThe filters must be changed regularly.consumer reviews of air purifiersThe maintenance and cost of these devices may make them a last resort for people without lung diseases, Perratore said. air cleaner for weedTrue HEPA filters for the Honeywell and Whirlpool units are $35 and $99, respectively. Then there's the energy cost to run the units, he added.There are also limits to what portable air purifiers can catch.

EPA notes that large particulates like dust mites and cockroach allergens may not be caught by these units. And Cowl said people who suffer from seasonal allergies may not get that much relief from having the air purifiers around."I don't think any air filtration system will completely prevent that," he said.Before buying an air purifier, Cowl, Solano and Perratore suggested checking out other options for cleaning indoor air. Better furnace filters can trap pollutants, Cowl said, but those must be changed regularly too. Look for the minimum efficiency reporting value (MERV) for air filters. This rating (1 to 20) is a standard for overall effectiveness. The higher the MERV rating, the more particulates the filter will screen out. True HEPA filters are rated between 17 and 20.However, Cowl said, many furnaces aren't designed to use true HEPA filters, so they may cause the furnace to work harder.Pillow and mattress encasements can limit dust mites in the bed, Solano said. And keeping a clean home is half the battle."

Open the windows, dust, vacuum with a HEPA vacuum; that would be the best thing. These are other things you can really do besides getting (an air purifier)," she said.Debbie Carlson is a freelance writer.Walk your way to better healthLooking beyond the obvious superfoodsFrom obese to Ironman, a tale of two tattooed triathletesChoose your air quality concern below FAST, FREE SHIPPINGOn all air purifiers and accessories. 100% Satisfaction GuaranteedOn all air purifiers and accessories. Price Match GuaranteeWe'll match the lowest price you find. Every day our customers tell us why they are thrilled with their decision to buy with us. Here are some of the most common reasons customers trust us for their air purifier needs again and again and even refer their friends. 30 Day Satisfaction Guarantee - Return a product within 30 days of receipt for a no hassle refund. No Hassle Returns - Fill out our easy 1 Step Return Process; we do everything else. FREE UPS Ground Shipping

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