Winix U450 Review

If you like Winix U300, you will truly appreciate and recognize the power of Winix U450 Signature series air purifier. Winix U450 is essentially a higher-end version of Winix U300 in terms of airflow performance and applicable area capacity. It still possesses the powerful five stages filtration system and incorporates all the practical features that will make our daily life activities much easier. Let's walk you through some of its sensible features and what makes Winix U450 one of the most popular flagship models.
± 439.99 p
     Annual filter ^    
± 140 p
Online price*
Latest Amazon price

Winix U450 Specification

ProductWinix U450
18.8 x 25.6 x 11.7 in
(47.8 x 65 x 29.7 cm)
Weight18.7 lb (8.5 kg)
Coverage (up to)450 sq. ft. (42 m2)
Dust free (CADR)298 cfm (506 m3/h)
Pollen free (CADR)343 cfm (583 m3/h)
Smoke free (CADR)291 cfm (494 m3/h)
Airflow speed78-300 cfm (133-510 m3/h)
- Lifespan
- Replacement cost ($)
HEPA filter
- Lifespan
- Replacement cost ($)
True HEPA filter
1 year
Carbon filter
- Lifespan
- Replacement cost ($)
AOC Advanced Odor Control Carbon Filter
1 year
Ionizer/ TechnologiesPlasmaWave Technology
UV-light/ PCO
Other filter
Anti-microbial coating
All-in-one filter
- Lifespan
- Replacement cost ($)
Filter F 114290 Replacement Filter
1 year
+- 139.99
Optional/ Addon
Noise level27 - 60 dB
Power consumption10 - 110 W
Timer/ Scheduler
SensorsVOC sensors (Air quality)
More color options
Auto mode
Air qualityAQ indicator
Filter change indicator
Wi-Fi/ BTBluetooth
Remote control
Child lock
Warranty5 years
Email/ Phone support
Product image

Key features

  • 5-Stage filtration
  • Washable pre-filter
  • CleanCel™ anti-microbial coating
  • True-HEPA Filter
  • Washable (AOC) Advanced Odor Control Carbon filter
  • PlasmaWave™ Technology
  • 4 fanspeed (Low, Medium, High and Turbo)
  • Auto mode / sleep mode
  • VOC sensor/ light sensor
  • Remote control
  • 5 years warranty

Winix U450 review

  • Minimalist design that is supported by the handy digital screen and remote control.
  • Comprehensive airflow purifying coverage that is great for large size room.
  • Impressive stats on all three dust, pollen, smoke CADR.
  • 5-Stage Filtration including PlasmaWave Technology.
  • The familiar True-HEPA filter that is extremely effective in capturing tiny micron size airborne pollutants.
  • AOC advanced Granular Carbon Filter that would captures almost all type of odors and smokes.
  • 4 fanspeed with auto mode.
  • Sleep mode that dim all indicator lights automatically when there is no light source.
  • Washable eco-friendly pre-filter and carbon filters.
  • 5 years warranty with the optional extension.
  • Considerably expensive with many cheaper alternatives such as Winix P450.
  • Bundled cassette filter replacement is certainly not the cheapest in the market.
  • Lacks built-in timer which is surprising given its availability in some of the lower end models.
  • CleanCel Antimicrobial coated on pre-filter is not as critical as other filtration.
  • Bulkier and heavier though justifiable with its capacity.

The starters

Winix U450 dimension
18.8 x 25.6 x 11.7 in
(47.8 x 65 x 29.7 cm)
Winix U450 weight
18.7 lb (8.5 kg)

Simple, minimalist concept that spread across Winix U450 design including the cheeky remote control. At a bigger and heavier 18.8 x 25.6 x 11.7 in dimension of with the weight of 18.7 lb, the clear white plastic is far from premium, it is certainly well-built and feels solid on every touch. What you will get from Winix U450 is a 5-stage filtration with PlasmaWave, informative digital display, 4 fanspeed with Auto mode, VOC SmartSensors, Sleep mode would auto dim indicator light when lights are out, filter replacement indicator, remote control, CARB approved Ozone-free, ENERGY STAR rated, AHAM certified and 5 years warranty.

Airflow, speed, and CADR

Winix U450 coverage
Purifying coverage
450 sq. ft. (42 m2)
Winix U450 airflow speed
Airflow speed
78-300 cfm (133-510 m3/h)
Winix U450 fanspeed
Brilliant airflow performance from Winix U450, the air purifier has a massive 450 sq. ft. purifying coverage that would cover living room, master bedroom, kitchen or even office meeting room. Airflow rate is punchy and powerful at 78-300 cfm. With 4 selectable fanspeed starting from Low, Medium, High to Turbo, you can expect abundant and consistent of airflow delivery rate regardless of the speed you selected. Standard features from Winix such as Auto mode that automatically adjust the ideal fanspeed based on surrounding air quality and Sleep mode that set fanspeed to low and dims down all indicator lights.
Winix U450 dust CADR
298 cfm (506 m3/h)
Winix U450 pollen CADR
Pollen CADR
343 cfm (583 m3/h)
Winix U450 smoke CADR
Smoke CADR
291 cfm (494 m3/h)
With the excellent purifying coverage, Winix U450 CADR surely does not disappoint. At a upper level of 298 cfm Dust CADR, for 343 cfm Pollen CADR and for Smoke 291 cfm. Whats lacking though is the air flow circulation that has a rather lower rate of. For more info, check out the CADR table above and compare it yourself.

What’s inside count

Winix U450 Pre-filter
Winix U450 HEPA filter
True HEPA filter
1 year
Winix U450 carbon filter
AOC Advanced Odor Control Carbon Filter
1 year
Winix U450 technologies
PlasmaWave Technology
Winix U450 other filters
Anti-microbial coating
^ Winix U450 filters/ technologies/ lifespan
The same 5-stage filtration setup as other Winix Signature series air purifiers expect with a bigger filters. Winix U450 first-stage pre-filter filtration would trap dust, hair, fur so the True-HEPA filter would not be fill up by the large airborne pollutants. CleanCel Anti-Bacterial Treatment is coated on the pre-filter to prevent micro-organism from growing. Any small-size particles (down to 0.3 microns) such as pollen, mold, spore would not get pass the True-HEPA filter. For gas and odor related irritants, the AOC Advanced Granular Carbon Filter is well in-placed to tackle them. Finally any leftover airborne pollutants and allergens would be neutralize by Winix PlasmaWave technology without releasing any harmful ozone.
Covered against
Winix U450 VS Dust



Winix U450 VS Pollen



Winix U450 VS Hair

Hair/ Pet hair


Winix U450 VS Dust mite

Dust mites


Winix U450 VS Mold/ Mildew

Mold/ Mildew


Winix U450 VS Pet dander

Pet dander


Winix U450 VS Virus/ Germ

Virus/ Germ


Winix U450 VS Tobacco smoke

Tobacco smoke


Winix U450 VS Chemical



Winix U450 VS VOCs



Winix U450 VS Smoke/ Gas

Smoke/ Gas


Winix U450 VS Odor



Winix U450 5-stage filtration is vastly efficient when pit against large and tiny pollutants, allergens, irritants, viruses and bacteria. Powered by immense airflow input/ output and wide purifying coverage, Winix U450 combined filtration is terrific in eliminating dust, hair, pet hair, pet dander, dust mites, pollen, mold and mildew.  On handling smokes and odors, Winix U450 is also terrific against chemicals, odors, cooking smell, fire, VOCs, tobacco smokes, cigarette, vapor, radon and ammonia.

Keep it down

Winix U450 noise level
Noise level
27 - 60 dB
Winix U450 power consumption
Power consumption
10 - 110 W
Winix U450 10 - 110 W power consumption and 27 - 60 dB noise level is reasonable at low, medium speed and high but not too overboard at higher speed. If you are planning to utilize Winix U450 in bedroom, low speed setting noise would not be too intrusive and other speed mode would be fine in large space-area. As an ENERGY STAR unit, power consumption is highly optimizable according to the fanspeed and operating hours the air purifier is running.

At what cost

Winix U450 MRSP/ RSP
+- 439.99
Winix U450 annual filter replacement cost
Annual Filter Cost
+- 140
^ Replacement filters/ estimated cost
Winix U450 is not the cheapest air purifier and so is the annual filter replacement cost. For a large size air purifier, don't expect it to be cheap as the filter replacement will never be on the affordable side. Winix U450 bundled cassette filter replacement is convenience to replace and it would only requires yearly change. To get the best filter deals out of Winix U450, visit Amazon via our affiliate links below.

Winix U450 VS the challengers

Winix P450

Offers the same purifying overage and CADR at a much lower price point. The downside is the air purifier only comes with 3-stage filtration with no built-in timer.
Honeywell HPA300

Honeywell HPA300

Cheaper in price and maintenance with improvement on purifying coverage and CADR. Drawback is you have to do without CleanCel Antimicrobial coating and PlasmaWave technology.
Blueair 503

Blueair 503

Consider moving up the chain with a big bump on purifying coverage, airflow and CADR. Con is the price you paid is significantly higher.

Verdicts and ratings

Build quality
Airflow delivery
Particle Filtration
Smoke Filtration

Frequently Asked Questions FAQ


Safety Tips

More on Winix Signature U450

At a bigger dimension, Winix Signature U450 air cleaner is bigger than Winix U300 and falls under the large size group. Many people might mistake it as Winix U300 at first impression with the identical flat based design and same plastic materials, . A long black bar of digital screen with plenty of electronic controls is located at the top; air vent is available at the back and both sides. No casters is required for this unit as the weight is still acceptable at 8.5 kg. Similar to Winix U300, many practical functions such as air quality sensor, remote control are included in package as well. Overall the unit looks clean and modern notably when the color LED indicator lights on. Next in line is the build quality, controls and some basic usability of the air purifier. Designed and created with the combination of consistent materials, Winix Signature U450 build quality is superb, long lasting and sturdy. The even base further reinforces the steadiness of the air purifier. Decent amount of airflow capacity that has positively no leakage as highlighted previously. The wide air ventilation is phenomenal at airflow disseminating all-around the home.

Applicable area and airflow

Winix U450
This is the segment that clearly differentiates Winix U300 and Winix Signature U450. As the higher range of Signature series, Winix Signature U450 air purifier is excellent for living room, master bedroom or anyplace up to 42 m2 (450 ft2). With Winix Signature U450 CADR (high Clean Air Delivery Rate) ratings, it can deliver an airflow rate from 130 m³/h to 247, 358 and 500 m³/h. A steady amount of incessant air circulation delivery will ensure that close proximity air-borne particles will be absorbed by the air purifier. On to the efficiency of purifying, needless to say Winix Signature U450 PlasmaWave push the capability of the air purifier to produce more clean air as a result the air purifier cover more ground on every flow. There is good amount of option you can set to boost the purifying in take and out take efficiency in accordance to your environment.

Filters and filtration

Signature series combined filters, the pre-filter will trap medium to large air contaminants without affecting other filters. Airborne allergens such as mold, pollen, mildew and pet dander would continue to be trap by the HEPA filter. The deodorization carbon filter is effective against persistent gases and odors from cleaning product, VOCs, tobacco smokes, paint and cooking that simply would not go away. Finally the PlasmaWave ionizer will neutralize airborne pollutants to harmless molecule. Almost all unwelcome air-borne pollutants and substances will be take down and release back to the air including dust, mold, mildew, fungus, pollen and pet dander.

Noise level and power consumption

Best to use in bedroom throughout the night, Winix Signature U450 noise level is subdue to a minimal tier all thanks to the perfectly created framework. Like other household appliances, the air purifier developed noise is still within most suitable level that you should be happy with. As for power consumption, Winix Signature U450 power utilization is at average pace. It may probably not have big impact on your electricity bills, but when the air purifier is running 24x7, that is the time you might likely feel the difference. As always, the air purifier power consumption compare with other household appliances is pretty standard.
noise graph

Final thoughts on Winix Signature U450

To sum it up, Winix Signature U450 is an exceptional air purifier that offers good value in both performance and pricing. If you are uncertain which unit to go for between U300 or U450, use the table above and compare the airflow specification as where it counts. Personally, I would suggest you to go for Winix Signature U450 as it offer better performance with justifiable price increase. In any case, Winix air purifier is a reputable company that will be a great choice as your long term air partner.

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