Alen A350 HEPA Review

See our review of the newer version: Alen FIT50

We like this unit because it comes with a HEPA filter and it is Energy Star qualified yet its weak performance can only deal with light odors.

Alen A350 HEPA Ratings

DESIGN - 82%



We like this unit because it comes with a HEPA filter and it is Energy Star qualified yet its weak performance can only deal with light odors.

User Rating: 4.58 ( 6 votes)

The Alen A350 HEPA air purifier is recommended for people are looking to rid their homes of airborne allergens, odors, and other pollutants. People who are very sensitive to impurities in the air will likely appreciate what the Alen A350 has to offer. Read our full review below for more information on this air purifier and how it can improve your health and well-being.


  • Good coverage
  • Eliminates up to 98% of airborne particles
  • Activated carbon system eliminates unpleasant odors
  • Has a timer and three speed levels
  • Lifetime warranty
  • Easy to replace filters


  • Dated design
  • Not a True HEPA air purifier
  • Loud on the two highest speed settings

Technical specifications

The Alen A350 uses a HEPA filtration system that consists of a pre-filter, a HEPA-type filter, and an activated carbon filter to clean your indoor air. It has four fan speeds available to users, and the noise output across all speeds varies from 36 to 65 dB. Designed to purify the air inside rooms that are up to 800 sq. ft. in area, this model also boasts a CADR rating of 203 CFM for dust, pollen, and smoke.

Specifications Sheet

Specs A350 HEPA
Dimensions 17.5” x 18.5” x 8.2”
Weight 16 lbs.
Area Coverage 800 Square Feet
Noise Level 36 to 65 dB
Power 120V, 60Hz
CADR Rating for Smoke 203
CADR Rating for Pollen 203
CADR Rating for Dust 203
Fan Speeds 4
Filter Type HEPA, Carbon, Ionizer
Odor Reducing Filter Yes (Carbon)
Control Style LCD Display, Electronic buttons
Timer Function Yes
Warranty Lifetime


The pre-filter was designed to remove larger airborne particles from the air, while the HEPA filter takes care of smaller pollutants to ultimately remove up to 98% of physical contaminants like dust, pollen, and pet dander from the air. Meanwhile, the activated carbon filter removes gaseous contaminants and odors. An ionizer is also thrown into the mix, which helps enhance the A350’s purifying capabilities and neutralizes germs in the air.

Although it’s advertised to work for spaces that are up to 800 sq. ft., the A350’s CADR ratings are rather low for a large-room purifier. This doesn’t necessarily mean that it’s ineffective, but if you’re an allergy or asthma sufferer, you might want to stick to using this machine inside rooms that are no bigger than 400 sq. ft. Doing so will ensure that there are at least 4 air changes per hour (ACH), which is what’s recommended to people with respiratory sensitivities.


The Alen A350 is fitted with a 12-hour timer, which is pretty impressive given that most air purifier timers clock in at a maximum of 8 hours. It also has a convenient filter change indicator that lets you know when a filter replacement is due. What’s more, the HEPA-type filter and the carbon filter are fused, so you really only need to change one filter with this model.


The Alen A350 features a rather dated design. Its plastic housing looks unappealing beside today’s metal-enclosed top-of-the-line air purifiers, but we won’t say that it’s downright ugly. It has an LCD display and electronic push buttons on its control panel, which is optimally placed on the upper part of its front panel. At 16 lbs. and measuring 17.5” x 18.5” x 8.2”, the A350 is built to function as a floor-standing air purifier.

Warranty and Support

Like all Alen air purifiers, the A350 banners a limited lifetime warranty. There’s really nothing much to say here except that this type of warranty always deserves appreciation, as it provides consumers with added peace of mind. Alen also has active customer support channels that can be found on the company’s official website.

Final Thoughts

The A350, overall, is a good air purifier that performs well and covers large spaces. However, the Alen A350 might not be for those who care about the appearance of their appliances, or those with severe allergies knowing that its ACH rating is rather lacking. Still, if you’re not too fussy about allergens and are simply looking for an air purifier that will improve the quality of air inside your home, the Alen A350 might just be the model you’re looking for.

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  • Robert

    I’m wondering whether this purifier can handle eliminating smoke as well. There are three smokers in my household, and the smell indoors is usually extremely bad.

  • James

    I couldn’t believe my eyes when I saw what a huge area this model can purify the air in, but now that I have bought and tested it myself, I can guarantee that it’s all true!

  • Martin

    We have one of these air purifiers at the office where I work. I’m actually very impressed with it, and I plan on buying one for home use as well.

  • Logan

    I needed an air purifier for the basement, so I bought this one since it says in the review that it can cover big surfaces. Since I use it in here, I am able to sit for hours on end working in the office that I improvised here without starting to sneeze frenetically. Thanks for the review and for opening my eyes about this amazing air purification system!

  • Amy

    How big of an area can it cover?

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