KNKA Air Purifiers for Home Bedroom Up to 1,695 Ft² in 1 Hr, APH4000, Black | HEPA Sleep Mode Air Cleaner with Washable Pre-Filter, AHAM VERIFIED, AQI Display, Pet Mode for Pet Dander, Dust & Pollen
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Availability:
Only 5 left in stock, order soon!
Arrives
Thursday, Aug 6
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Color: Black
Features
- AHAM Verified & High CADR Value: Certified by the Association of Home Appliance Manufacturers, this air purifier provides reliable performance with a Smoke/Dust/PM2.5 CADR of 226 CFM (384 m3/h) and a Pollen CADR of 244 CFM (415 m3/h). AHAM certification guarantees effective, high-speed air purification for your home.
- Efficient Airflow Design: Engineered with dual front-and-back air intakes and dual side outlets, this purifier maximizes circulation for faster air exchange. It refreshes the air 4.8 times per hour in rooms up to 350 ft2, reaching up to 80% purification efficiency, while still delivering 1 full air refresh per hour in larger spaces up to 1695 ft2 with about 45% efficiency, helping maintain cleaner, fresher air throughout your home.
- Dual Filters & 3-Stage Design: Equipped with dual front-and-back cartridges, each featuring a three-stage filtration system: a washable pre-filter for larger particles, a High-Efficiency filter, and an activated carbon filter. 3-in-1 filter system traps everything from pet hair to microscopic particles, ensuring thorough purification. (Please remove the filters plastic packaging before installation.)
- PET & ECO Modes: PET Mode increases airflow to tackle pet hair, dander, and odors, refreshing the air in just 30 minutes. ECO Mode saves energy and extends filter lifespan by entering standby when air quality is excellent, then restarting automatically when purification is required.
- Multiple Modes & Fan Speeds: Includes Sleep Mode with noise levels as low as 22-24 dB for ultra-quiet nights, Auto Mode for effortless adjustments, and four fan speeds for personalized comfort. Select the setting that suits your needs any time of day.
- Real-Time Air Quality Display: A built-in sensor monitors indoor air and displays the AQI in real time. Color-coded lights make it easy to check your air quality in an instant.
Description
Founded in 2021, KNKA designs home appliances that make everyday living feel cleaner, lighter, and more comfortable. We focus on air care solutions, including dehumidifiers and air purifiers, combining high performance with refined, minimalist design. We believe technology should seamlessly enhance everyday life while preserving the beauty of modern homes. Visit the Store Visit the Store
Product Dimensions : 8.15 x 12.36 x 17.09 inches; 9.68 pounds
Item model number : APH4000
Date First Available : December 26, 2025
Best Sellers Rank: #620 in Home & Kitchen (See Top 100 in Home & Kitchen) #5 in HEPA Filter Air Purifiers
#5 in HEPA Filter Air Purifiers:
Customer Reviews: 4.7 4.7 out of 5 stars (2,812)
Power Source: ac_dc
Control Method: Touch
Filter Type: 3-Stage Filter
Floor Area: 350 square_feet
Noise Level: 24 db
Particle Retention Size: 0.3 micron
Controller Type: Touch
Wattage: 45 watts
Contaminant Filtration Capability: dust, odors, pet_dander, pet_hair, pollen
Special Features: AQI Display, Dual 3-Stage Filters, PET & ECO & AUTO & SLEEP Mode, Washable Pre-Filter
Filter Class: HEPA and Activated Carbon
Brand Name: KNKA
Model Number: APH4000
UPC: 754175826438
Unit Count: 1 Count
Warranty Description: 2-Year Warranty
Included Components: 1 x Air Purifier, 2 x 3-Stage Original Filter (Pre-Installed), 1 x User Manual
Part Number: 002
Item Dimensions D x W x H: 8.15"D x 12.36"W x 17.09"H
Item Weight: 9.7 pounds
Specification Met: CARB Certified, DOE Certified, ETL Certified, FCC Certified
Color: Black
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Aug 6
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: White
I was skeptical about this air purifying unit at first, but after a month of use, it completely changed my mind. I have nothing but praise for this excellent air cleaner. Setup was super easy, and the two extra-large carbon filters on each side are a huge plus. The bedroom where my bedbound wife stays had started to smell musty and collect a lot of dust, but within just two days of running and adjusting the speed of the unit, dust and odor particle levels dropped from .23 to 0.007 and breathability went from toxic to super clean. A couple of things to note: after a month, be sure to clean the unit outdoors. The intake fins on both sides were packed with dust from pulling in air to purify. I used a leaf blower outside and was shocked at the size of the “dust bunnies” that came out of the intake covers and filters. I tried washing the filters, but be careful with the silver tape on the edges—it can start to fail when wet. I recommend buying two new filters every three months rather than washing them with water. Blowing them out with a leaf blower works well to remove particulates and helps extend filter life. Overall, this purchase is an easy win. It cost half as much as other units and, in my opinion, performed far better and quieter than the pricey ones.
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Reviewed in the United States on June 22, 2026 by Mr. Balloon LLC
Color: White
Okay, I don't normally jump on here to review products, but this filter is one of the most well-made items I've purchased in years. It works flawlessly and quietly. Setup was easy and I daresay fun. Everything fits together perfectly. It moves a ton of air for its size. Operation is a cinch. And it's markedly improved the air quality in our house, as well as reducing the amount of dust that gathers on everything. I move it around the house sometimes, just to give each room a little boost. I will probably end up buying another one at some point.
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Reviewed in the United States on July 16, 2026 by Jason M. Spencer
Color: Black
Excellent air purifier. It works quickly, easy to operate, and powerful. I have a pet cockatiel bird, who produces a lot of dust. I purposefully stood by the machine while my bird was preening and watch the dust get zapped in and disappear. Amazing! I have it in my living room right by my wall AC unit and I can see it actively work once my AC kicks in. Once the AC turns off, the purifier finishes cleansing the area and returns to baseline. It's very quiet, more quiet than the smaller shark brand I have in the other room. Birds have very sensitive respiratory systems so you have to be weary of products that off-gas, may produce ozone, or have PTFE coatings, all of these can be fatal to the bird. I messaged the customer service email to check, and not only were they very quick to acknowledge me, they were able to confirm that their filters don't have any of these issues. That is an A+++++ in my book. If you have a pet bird and in need of an air purifier, this one is definitely worth it!
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Reviewed in the United States on July 21, 2026 by Catherine Ruiz
Color: White
After using this filter for one month straight everyday, I do feel like it does a difference in the quality of my air. Its not just blowing air but actually sucking and filtering all the contamination in my air. I have two cats, my window is open most of the time and I cook alot of steak. So when I turned this KNKA purifier on, it displays the score of my air quality and then drops after 30 minute of use. Noise level at night is very quiet. Lighting can be adjusted if it bothers you, keep all the lights off or just the light of the settings on. I put this next to my bed and I have been getting better sleep quality, no stuffy nose in the summer due to pollen or allergies. It is amazing! I will update videos soon and pictures.
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Reviewed in the United States on July 5, 2026 by Erick Cisneros
Color: White
This thing works so well! I have three dogs and they sleep with me in my room and I also have my PC in there and it gets so dusty and dirty and ever since I bought this thing and keep it on pet mode, my room literally has little dirt and dust and it keeps the room smelling clean as well. I absolutely think this purifier is worth it. It's quiet, but does have a very satisfying hum to it which I've become reliant on since I hate the 'sound' of silence. The filters are dirty after a few months and it's crazy the amount of dirt this thing sucks up. Very impressed!!
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Reviewed in the United States on July 17, 2026 by Malachi
Color: Black
I purchased when it was $119 then I went to get another one and it jumped to $149. Works good and like the light that tells you what the air quality is. The noise sounds like a fan which helps me sleep. I love the option of 4 fan settings, I don’t think it’s worth $149
Reviewed in the United States on June 20, 2026 by Lisa carter
Color: White
WHAT A PLEASANT SURPRISE! This is going to be one of my rare extra-thorough reviews, because I was simultaneously impressed and quite relieved that I got an excellent product for the money. When I saw product on Amazon while looking for HEPA filters, it had a funny name and sounded like a dime-a-dozen 'off-brand'. I assumed it was passable, and would be affordable, but probably less than optimal. BAD ASSUMPTION on *my* part. This air filter is not just good, it's *great*. I honestly didn't expect anything so expertly engineered and built (in all ways), for the money! Unit is compact, sturdy. Fits into a small area of the room, looks like good home equipment. Yet discreet appearance. Most importantly, it packs a lot of filtration power into a small form factor. And it runs as quietly and unobtrusively as possible, based on in-the-moment transient air quality. Every feature is thoughtfully designed for common sense, ease-of-use, aesthetics and reliability: - Sensible, intuitively operated layout. - Components are solid, fit together virtually seamlessly, yet operate smoothly and conveniently. - Filter panels fold down front and back, but remain on the machine making filter access easy & problem free (you don't have to set panels aside and have to somewhat awkwardly try to fit them back together, with some effort, like my older other-brand HEPA air filter does it). - Filter inspection, cleaning, and replacement, foolproof. Easy and straightforward. - Filters themselves are superb: Modular, tight and sealed. Very well built and clean design. They went the extra 9 yards to create very professional quality replacement filters. - Pre-filter is intentionally placed for hassle-free ease of access and cleaning. - Has a hyper-responsive realtime readout for PM2.5 count (the tiny health-impacting particles that pollute the air). - Responds instantly to air quality changes by updating the PM2.5-count display, and fan speed and display color (all indicating filtration mode) - Main display light can be turned off at night, so you can get some sleep. - Optional sleep mode, button (moon icon) turns off the machine so that it can be instantly restored to previously settings if you want that (but I prefer to just turn off the display panel light). - Child lock - Has a filter-life-remaining readout. Filters can be cleaned to get more life out of them. - Documentation is brief yet very clear. Easy to quickly understand everything you need to know about the machine. First experience using it was great! Put it beside my bed to reduce pollen count. It read PM 2.5 count 9. When I lifted the comforter suddenly the PM2.5 count went up to 12, then quickly down to 11, 10... Then I did something else that disturbed the dust/pollen and it went up to 13 for about 10 seconds. The display changed from green to blue, then cleared the dust fast, dropped back down to 10... 9, green ... quiet. What surprised me was its instantaneous responsiveness, letting me know the sensor and firmware design is excellent and exactly what the air quality was, without waiting. User guide tells you the PM count meanings, in four ranges from good quality to unhealthy. But what's great is how dynamically responsive it is. It is constantly checking the PM count in realtime and instantaneously responds to air quality changes by shifting fan speed and display color. The whole front panel is lit but has a very nice aesthetic like a suble star field. Hard to explain the appearance but cleaver and pleasant. And display can be turned off at night. The color of the front panel corresponds to the self-adapting air quality mode the unit is in. Green panel light = good air quality, fan at lowest speed, Blue panel light = air less ideal, needs more cleaning, fan is a little faster Yellow panel light = air pretty polluted fan even faster. Red front panel light = air unhealthy, fan highest speed
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Reviewed in the United States on June 13, 2026 by Fixer-upper
Color: White
This is my 4th air purifier and the best so far. It gives a reading of the air quality in the room, has 4 fan settings and isn't too loud on the highest setting. It works well but I bought it because I live in a condo and neighbors cigarettes smoke fills my place. I have to have it close to me but it works well. I also bought specific smoke filters but haven't tried them yet. I will review them separately.
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Reviewed in the United States on July 5, 2026 by Amazon Customer