Winix HR900 Review: The New Ultimate Pet Air Purifier
Winix HR900 Specification
Product | Winix HR900 |
Dimension | 16.3 x 23.6 x 9.6 in (41.4 x 59.9 x 24.4 cm) |
Weight | 18.7 lb (8.5 kg) |
Fanspeed | 4 |
Coverage (up to) | 300 sq. ft. (28 m2) |
Airflow speed | 56.5-197.8 cfm (96-336 m3/h) |
Dust free (CADR) | 200 cfm (340 m3/h) |
Pollen free (CADR) | 220 cfm (374 m3/h) |
Smoke free (CADR) | 194 cfm (330 m3/h) |
Filtration | 5-stage |
Pre-Filter - Lifespan - Replacement cost ($) | Pre-filter Permanent |
HEPA filter - Lifespan - Replacement cost ($) | True HEPA filter 1 year |
Carbon filter - Lifespan - Replacement cost ($) | Washable Advanced Odor Control (AOCTM) Carbon Filter 1 year |
Ionizer/ Technologies | PlasmaWave Technology |
UV-light/ PCO | UV-C Light 20,000 hours |
Other filter | Winix Ultimate Pet Filter 1 month |
All-in-one filter - Lifespan - Replacement cost ($) | Filter T Replacement Set 1 year +- 99.99 |
Optional/ Addon | Winix Ultimate Pet Filter U replacement pack (12 pack) 12 months+- 19.99 |
Noise level | |
Power usage level | 90 W |
Timer/ Scheduler | 1, 4, 8 hours |
Sensors | Smart Sensor, Light Sensor |
Auto mode | |
Air qualityAQ indicator | |
Filter change indicator | |
More color options | |
Wi-Fi/ BTBluetooth | |
ENERGY STAR | |
Remote control | |
Child lock | |
Warranty | 2 years |
Email/ Phone support |
Key features
- 5-stage filtration with PlasmaWave™ Technology
- Permanent and Ultimate Pet pre-filter
- AOC Advanced Granular Carbon Filter
- True-HEPA filter (99.97% efficiency)
- 4 fan speeds - Low, Medium, High, Turbo, Auto mode/ Sleep mode
- Timer (1, 4, 8 hours)
- Air quality indicator - Blue (good), Yellow (fair), Red (poor)
- Light sensor, Smart sensor
- 2 years warranty
Pros
- Decent pricing for a 5-stage filtration specialized in pet allergies.
- 300 square feet purification is a big leap from the previous WAC9500 model.
- Double protection with Ultimate pet pre-filter on top of the existing pre-filter.
- Dependable True-HEPA and AOC carbon filter that is effective with contaminants.
- Powerful 4 fan speed plus Auto mode and Sleep mode.
- Built-in timer and child lock that is easily accessible through the control panel.
- Improved 2 years warranty than the previous 1-year warranty.
Cons
- High annual filter replacement cost especially if you add the ultimate pet filter.
- Slightly expensive as the cheaper Winix 5500-2 can do the same job with the ultimate pet filter add-on.
- Smart sensors inconsistent reaction time with the surrounding airborne particles.
The starters
Winix HR900 is a modern approach to air purifier without sacrificing its practicality. At 16.3 x 23.6 x 9.6 in and 18.7 lb weight, it is exactly the same dimension as HR1000 so expect the same build quality. Carrying the air purifier is easy with the back handle. At the opposite side, there is an AQ indicator light that will change color to reflect on room air quality. When the bar color is Blue means air quality is good, Yellow = fair, and Red = poor. Like most Winix models, air inlet is at sides with many small vent holes at the front. Air outlet is at typical top right behind the controls.

Speaking of controls, there are 6 clickable buttons plus Smart and light sensors on top. Starting with the Power button that we are all familiar with. Right above it is the filter reset button that is only used after you replace with a new filter set. Press and hold the button for 5 seconds to complete the filter countdown timer reset. Mode button will cycle between Auto, Sleep, Low, Medium, High, or Turbo speed. PlasmaWave button will activate/ deactivate the features on press. Timer button will cycle between 1, 4, 8 hours and no timer on press. Press and hold for at least 3 seconds will enable/ disable the Air Quality light. Lastly, child lock will lock all functions when you press and hold the button for at least 3 seconds. This prevents children from meddling with the air purifier controls. To your most left, there is the Smart Sensor used to detect nearby air quality. The light sensor checks ambient light and auto adjusts the LED indicators brightness.
To recap on HR900 long list of features, you have AHAM, Ozone-safe certified, UL listed, and ENERGY STAR. 5-stage filtration with Ultimate Pet Filter U. 4 fan speed plus Auto, and Sleep mode. AQ indicator light, Child lock, and 2 years warranty.
Airflow, speed, and CADR
What’s inside count
This is called the ultimate pet air purifier for a reason. Starting with the first line of defense against pet hair and dander. You have the add-on Ultimate pet pre-filter and the standard, washable pre-filter. Both work simultaneously well with each other. Next is the AOC Advanced Granular Carbon Filter. The carbon filter will capture smoke and pet odors well and extends the HEPA life. With the True HEPA filter well-protected, no bacteria or germs will be able to fly back out. The HEPA filter efficiency is rated at 99.97% efficiency on microorganisms as small as 0.3 microns. Ending the filtration is Winix own PlasmaWave Technology. The PlasmaWave will safely break apart allergens and chemical vapors at a molecular level.
Dust mites, pet dander, bacteria, and germs are no biggie for this air purifier when you have 2 pre-filter. Adding a 300 square feet and True HEPA filter, no mold, pollen, or mildew will be able to fly pass HR900. AOC carbon filter is ready to trap any pet odors plus chemicals vapor from cigarette, radon, or VOCs.Keep it down
We don't have the official noise figure for HR900 and we are not going to test it since is similar to other Winix models. It's safe to assume the bar would be between 20 - 60 dB. In any case, Sleep mode would be the go-to setting for bed time use. Power usage is at a max 90 W (Turbo speed). It might seem high but compare with other appliances, it is not. Don't forget there is Auto mode that will manage your fan speed thus the energy consumption rate.At what cost
^ Replacement filters/ estimated cost
Winix HR900 VS the challengers

Winix HR950
Around the same price but with better purifying coverage, CADR, and anti-microbial coating. While you're at it, why not consider HR1000 that is priced slightly higher but is Wi-Fi enabled. Super cool.
Winix 5500-2
Is Pet filtration really your thing? If not Winix 5500-2 would be a better bet with better airflow performance, CADR, and a cheaper price tag. Plus, it is also compatible with the ultimate pet filter.
GermGuardian AC5250PT
If you need a cheaper, slimmer air purifier with UV-C light and antimicrobial, look no further. Performance wise it is incomparable to HR900.