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Winix U450 Signature HEPA Air Cleaner

Winix U450 Signature HEPA Air Cleaner with PlasmaWave Technology

Model: U450 | SKU: wi3175
Price: $379.99
10% Off Select Air Purifiers
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  • Product Overview

    The Winix Signature U450 Air Purifier is part of Winix’s Signature Series air cleaners and combines 5 stages of advanced filtration to capture virtually all symptom-triggering allergens, chemicals, and odors. This Winix Air Purifier is ideal for your family room, living room, and other large areas in your home up to 450 square feet. PlasmaWave technology and air quality sensors ensure your air is as pure as possible. Plus, it's loaded with convenience features that simplify operation and make it easier than ever to breathe cleaner day after day. These features include a remote, electronic controls, and washable filters. In addition, this model is Energy Star-qualified for efficient and money-saving operation.

    PlasmaWave Technology

    Winix’s patented PlasmaWave™ Technology helps separate them from the competitors. This technology safely breaks apart odors, allergens, and chemical vapors at a molecular level. This creates positive and negative ions that combine with natural water vapor to form hydroxyls, which instantly neutralize viruses, bacteria, chemical vapors, odors and gases-leaving your air as clean as possible. The Winix U450 has increased flexibility with an option that lets you turn the PlasmaWave feature on and off.

    Convenient Operation

    The Winix U450 Air Purifier features air quality sensors the presence of airborne particles and adjusts settings automatically to deliver set-and-forget convenience. Simply turn on Auto mode to take advantage of this convenient feature. There are also 4 fan speeds to choose from for more control over clean air distribution. In addition, the Winix U450 uses electronic controls and comes with a remote to make setting or fan speed changes.

    Five-Stage Filtration

    The Winix U450 Air Cleaner features an advanced 5-step filtration system that removes the most aggravating indoor allergens.

    • Stage 1: The Anti-Bacterial Pre-Filter effectively traps large particles such as pet hair, lint, dust and fibers; significantly inhibits the growth of impurities; maximizes HEPA filter life; and can be rinsed and reused repeatedly during the entire life of the filter cassette.
    • Stage 2: Innovative Early-Stage Filter treated with Antimicrobial CleanCell Protection effectively reduces the development of bacteria, fungi, mildew, molds and dust mites.
    • Stage 3: Next, air moves through a true HEPA filter that captures nearly 100% of microscopic allergen particles, including pollen, pet dander, mold, dust, smoke, and bacteria.
    • Stage 4: Premium quality activated carbon filter enhances air quality by effectively absorbing and neutralizing strong odors caused by ammonia, bacteria, and other compounds associated with pets and household objects, and can be washed and reinserted for a year of use.
    • Stage 5: As a final step, air is treated with Winix's patented PlasmaWave technology to remove airborne viruses, chemical vapors, gases, and remaining odors. The PlasmaWave system uses naturally formed hydroxyls to neutralize these airborne pollutants at the molecular level, rendering them harmless.

    Additional Features

    Winix FresHome P450 - AHAM-verifide

    • Electronic Controls - The Winix U450 features easy-to-use electronic controls with LED indicator lights and a color-coded air quality sensor.
    • Remote Control - Adjust the air purifier's settings comfortably from a distance with the full-featured remote control.
    • Filter Replacement Indicator - Always know when it's time to replace the filters with the convenient check filter indicator. This indicator works off actual filter usage versus a published filter schedule, so you only purchase filters when necessary.
    • Dimming Light Sensors - All the LED indicator lights can be dimmed for the overnight hours, so they won't disturb you while you sleep.  
    • Quiet Operation - On its lowest speed, the U450 operates at 27 decibels of sound - quieter than a whisper.
    • AHAM-Certified - The U450's effectiveness is certified by the Association of Home Appliance Manufacturers (AHAM).
    • High CADR Scores - In testing, this model received high Clean Air Delivery Rate scores for its coverage area. These scores indicate its effectiveness in filtering out various pollutants: Dust - 298, Pollen - 343, and Smoke - 291.
    • Carrying Handle - Use the built-in carrying handle to move the unit around easily and get clean air anywhere in your home.
    • Ozone-Safe - PlasmaWave Technology is ozone-safe and complies with California Air Resources Board (CARB) regulations.
    • Energy Star-Qualified - Energy Star air purifiers are 40% more efficient than conventional models and can save you up to $25 annually on your operating costs.


    The Winix FresHome U450 Air Cleaner cleans large rooms quickly and efficiently using a 5-stage filtration system and Winix's patented PlasmaWave technology.

    What Customers Love

    • Energy Star-Rated: This model has earned an Energy Star-rating for being 40% more efficient than conventional models, which saves you money on energy costs.
    • Air Quality Indicator: The air quality sensor detects large concentrations of pollutants then automatically adjusts the purification speed with no intervention needed.
    • Vacuumable Filters: Vacuum the carbon and HEPA filters clean to help them last longer and reduce your filter replacement costs.

    Things To Consider

    • Large Size: The U450 is Winix's largest air cleaner to date and fits best in large rooms and spaces.

    Manufacturer's Warranty

    5-Year Limited Warranty

    Manufacturer's Literature

    Winix U450 Owner's Manual
    User's Guide for the Winix U450

    What's In The Box?

    • Winix U450 Air Purifier
    • Filter Cartridge
    • Owner's Manual

    View All Air Purifiers »
  • Specifications

    Manufacturer-Suggested Room Size (sq. ft.)450 sq. ft.
    Maximum Room Size for 4 Air Changes Per Hour 562 sq. ft.
    Recommended ForAsthma, General Air Quality, Smoke, Odor & Chemical, Allergies
    Best Fit Ideal for allergy- and asthma-sufferers and fighting airborne smoke, odors, and chemicals
    Height25.6 in.
    Width18.9 in.
    Depth11.8 in.
    Weight18.7 lbs.
    Filtration System
    • Carbon Filter, Washable carbon pre-filter
    • Germ Treatment, PlasmaWave technology plus Antimicrobial CleanCell Protection
    • HEPA Filter, True medical-grade HEPA filter
    • Pre-Filter, Washable large particle pre-filter
    Pre-Filter TypeWashable large particle pre-filter
    HEPA Filter TypeTrue medical-grade HEPA filter
    Amount of CarbonWashable carbon pre-filter
    Type of Germ TreatmentPlasmaWave technology plus Antimicrobial CleanCell Protection
    Number of Filters to Change2
    HEPA Filter1 year
    Carbon Filter3 months
    CADR: Pollen Score343
    CADR: Dust Score291
    CADR: Smoke Score298
    Number of Fan Speeds4
    Amount of Air Moved (Max CFM)300 CFM
    Minimum Noise Level29 dB
    Maximum Noise Level56 dB
    Filter Change IndicatorYes
    Programmable TimerNo
    Remote ControlYes
    Amperage1.4 Amps
    Voltage110-120 V
    Energy StarYes
    Ozone EmissionNone
  • Product Q&A

    Have a shipping or payment-related question?
  • Reviews

    View All Winix U450 Signature HEPA Air Cleaner with PlasmaWave Technology Reviews


    by PowerReviews
    Winix U450 Signature HEPA Air Cleaner with PlasmaWave Technology

    (based on 3 reviews)

    Ratings Distribution

    • 5 Stars



    • 4 Stars



    • 3 Stars



    • 2 Stars



    • 1 Stars




    of respondents would recommend this to a friend.


    • Attractive (3)


      Best Uses

          • Reviewer Profile:
          • Quality oriented (3)
          • Primary use:
          • Personal (3)

        Reviewed by 3 customers

        Sort by

        Displaying reviews 1-3

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        Works well. Happy with the purchase.

        By Greig

        from Lexington, MA USA

        About Me Quality Oriented

        Verified Buyer


        • Attractive Design
        • Quiet
        • User friendly


        • Big

        Best Uses

          Comments about Winix U450 Signature HEPA Air Cleaner with PlasmaWave Technology:

          We use this unit to cover our kitchen, livingroom, and a bedroom. Although it is large (3 feet hight, close to 2 feet wide) and thus hard to ignore visually, it's operation is quiet and unassuming.
          It seems to do a good job with minimizing kitchen smells and cat dander. We just leave it on all of the time and allow its sensors to increase/decrease the fan as needed. Set and forget.

          • Primary use:
          • Personal

          Fan Turbulence a Problem

          By The Air I Breath

          from Richmond, Va.

          About Me Quality Oriented

          Verified Buyer


          • Affordable
          • Attractive Design


          • Loud

          Best Uses

          • Larger Rooms

          Comments about Winix U450 Signature HEPA Air Cleaner with PlasmaWave Technology:

          The turbulence created by the fan on high or turbo creates a distubing sound that sounds like something is loose. This noise is present even when the filters and front cover are removed. So the noise originates from the fan housing - apparently from the air turbulence - a poor design by Winix!

          • Primary use:
          • Personal

          (2 of 2 customers found this review helpful)


          Working great for us

          By Sanjoy

          from CA

          About Me Quality Oriented

          Verified Buyer


          • Attractive Design
          • Quiet
          • User friendly


          • Pricey

          Best Uses

          • Anywhere

          Comments about Winix U450 Signature HEPA Air Cleaner with PlasmaWave Technology:

          We are using the product in the living room and bedroom, primarily to help us with pet allergies. In the 2 weeks of usage, we have found it helpful with our indoor allergies. The quiet mode is fairly silent and you can't tell it's even running. Not sure how easy it will be to clean the filters.

          The only issue is that we see is that in Auto mode, it typically defaults to Quiet mode, even while we are struggling with allergens so we manually have to increase the fan speed.

          • Primary use:
          • Personal

          Displaying reviews 1-3

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