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Winix U300 Signature HEPA Air Cleaner

Winix U300 Signature HEPA Air Cleaner with PlasmaWave Technology

Model: U300 | SKU: wi3174
Price: $279.99
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  • Product Overview

    Let the Winix Signature U300 Air Purifier provide the cleanest air you can create inside your home. Part of the Signature Series air cleaners, the U300 is one of Winix's largest and most powerful air purifiers. It combines 5 advanced air cleaning stages to capture virtually all symptom-triggering allergens, chemicals, and odors polluting your air. These stages include true HEPA filtration and Winix's patented PlasmaWave technology, which neutralizes airborne pollutants at the molecular level. Ideal for bedrooms, dens, and other mid- to large-sized rooms up to 300 square feet, this model is Energy Star-qualified for efficiency and low-cost operation. Convenience features like an air quality sensor, electronic controls,  and a check filter indicator help take the guesswork out of day-to-day use.

    Five-Stage Filtration

    The Winix U300 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. The Winix U300 has increased flexibility with an option that lets you turn the PlasmaWave feature on and off.

    After air is thoroughly cleaned, it's released into your space with the help of a super-efficient yet whisper-quiet fan. Choose 1 of 4 speeds for greater control over clean air distribution. The lowest and quietest speed is great to use overnight while the highest speed purifies your space quicker.

    Automatic Air Cleaning with Air Quality Sensors

    The Winix U300 Air Purifier features automated controls to take the guesswork and hassle out of cleaning your air. In Auto mode, an air quality sensor monitors the presence of airborne particles and adjusts the fan speed automatically—making operation about as hassle-free as possible.

    Certified for Efficient and Effective Operation

    This model, and its efficient fan and features, earned an Energy Star-rating for energy- and cost-saving operation. Energy Star air purifiers are 40% more efficient than conventional models and can save you up to $25 annually on your operating costs. The U300's effectiveness is also certified by the Association of Home Appliance Manufacturers (AHAM). In testing, this model received high Clean Air Delivery Rate scores for its coverage area. Lastly, it received high CDAR scores, which indicate its effectiveness in filtering out various pollutants: Dust - 197, Pollen - 214, and Smoke - 197.

    Additional Features

    Winix FresHome P300 - AHAM-verifide

    • Electronic Controls: The Winix U300 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 U300 operates at 26 decibels of sound - quieter than a whisper.

    • 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.


    The Winix U300 Signature HEPA Air Cleaner with PlasmaWave Technology is an efficient, effective air purifier that's trusted for rooms up to 300 square feet.

    What Customers Love

    • Advanced 5-Stage Filtration:  Its 5-stage filtration uses a HEPA filter to catch 99.97% of allergens down to .3 microns, while its patented PlasmaWave technology safely breaks apart odors, chemical vapors, and other pollutants at the molecular level to offer superior all-around air cleaning.
    • Energy Star-Rating: This recognition means it saves you energy and money.
    • Simple Operation: An Auto mode, electronic controls, and a remote control make operation a breeze.

    Things to Consider

    • Replacement Filters: You'll need to replace your HEPA filter after about a year. Luckily, we carry various replacement filters for when that time comes (check out our Winix accessory list).

    Manufacturer's Warranty

    5-Year Limited Warranty

    Manufacturer's Literature

    Winix U300 Owner's Manual
    User's Guide for the Winix U300

    What's In The Box?

    • Winix U300 Signature HEPA Air Purifier
    • Filter Cartridge
    • Owner's Manual 

    View All Air Purifiers »
  • Specifications

    Manufacturer-Suggested Room Size (sq. ft.)300 sq. ft.
    Maximum Room Size for 4 Air Changes Per Hour 324 sq. ft.
    Recommended ForAsthma, Odor & Chemical, Smoke, General Air Quality, Allergies
    Best Fit Ideal for allergy- and asthma-sufferers and fighting airborne smoke, odors, and chemicals
    Height21.7 in.
    Width16.3 in.
    Depth10.4 in.
    Weight13.4 lbs.
    Filtration System
    • HEPA Filter, True medical-grade HEPA filter
    • Germ Treatment, PlasmaWave technology plus Antimicrobial CleanCell Protection
    • Carbon Filter, Washable carbon pre-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 Score214
    CADR: Dust Score197
    CADR: Smoke Score197
    Number of Fan Speeds4
    Amount of Air Moved (Max CFM)173 CFM
    Minimum Noise Level28 dB
    Maximum Noise Level52 dB
    Filter Change IndicatorYes
    Programmable TimerNo
    Remote ControlYes
    Amperage0.8 Amps
    Voltage110-120 V
    Energy StarYes
    Ozone EmissionNone
  • Product Q&A

    Have a shipping or payment-related question?
  • Reviews

    View All Winix U300 Signature HEPA Air Cleaner with PlasmaWave Technology Reviews


    by PowerReviews
    Winix U300 Signature HEPA Air Cleaner with PlasmaWave Technology

    (based on 2 reviews)

    Ratings Distribution

    • 5 Stars



    • 4 Stars



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    • 2 Stars



    • 1 Stars



    Reviewed by 2 customers

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    Not for Chemical Smells

    By dragonmaki

    from edison, NJ

    Verified Buyer


    • Affordable
    • Attractive Design
    • Quiet
    • User friendly


      Best Uses

        Comments about Winix U300 Signature HEPA Air Cleaner with PlasmaWave Technology:

        I think this purifier may be better for organic smells and dust, and I may have a chemical problem with my air. I had bad air in my house from "off-gassing" from a memory foam mattress. It did not help with that. At the time I bought the purifier, I didn't know what was wrong.

        I also tried it in the converted garage, which has its own particular smell. It didn't get rid of the smell, and worse, it must have absorbed some of it, because when I moved it back to a room upstairs, it started pumping out air that smelled like the garage! That was the last straw, as the thing was now spreading bad air around.

        The air in my house is still not great (though getting rid of that memory foam solved the bulk of the problem!). I sleep on an air mattress for now, and since I'm close to the floor, I feel that dust that comes up from the floor. Not regular dust but something from whatever is coating the wood. Especially if I walk on the wood or step in a way that scratches the surface and then lie down, I breathe something in and feel sick with a slight headache. I am not even kidding, I try to walk in a way that doesn't disturb the floor.

        I wish I could just fix the air and make it better. It is not only from the floor, but the area carpet and bed frame seems to have absorbed some of the chemicals from the memory foam mattress, so I still can't sleep in that room even though I got rid of the mattress. I tried it and after two nights did not feel well.

        • Primary use:
        • Personal

        (1 of 1 customers found this review helpful)


        Good unit

        By John

        from Palm Springs

        About Me Quality Oriented

        Verified Buyer



            Best Uses

              Comments about Winix U300 Signature HEPA Air Cleaner with PlasmaWave Technology:

              This unit works well but is not as quiet as my older Rabbit Air.
              The Plasmawave makes a sight buzzing noise and cannot be
              Turned off.

              • Primary use:
              • Personal

              Displaying reviews 1-2

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