Sharp KI-N42
No store we follow ships this model to the United States. This page says what it can do, and which similar robots you can buy here.
Which robot is right for your home? Find out in 7 questions →
Before you buy, compare it with 2 recommended alternatives
No store here sells this model today, so beside it the highest-scored model for the same room size that one does, and the cheapest of the top 10.
Green is the best of these 3, also when they share the lead.
| This model Sharp KI-N42 | Highest score here Levoit Core Mini-P Best on 3 facts | Cheapest of the top 10 Blueair Blue Pure 411i+ Max | |
|---|---|---|---|
| Price and ranking | |||
| The lowest price today at a store that ships to you, shipping included. A price with an asterisk comes from a store abroad, and its shipping cost is our own estimate. Lowest price | – | $44Levoit (brand store) best | $135Blueair (brand store) |
| Our own score out of 10: 60% measured facts and 40% store ratings. Price does not count. Score | not in our ranking | best | |
| Where the model stands in our ranking, among the purifiers for the same size of room. Rank | – | rank 1 of 6 for small rooms | rank 1 of 7 for medium rooms |
| The average of the stars buyers give at the stores, with the number of reviews behind it. We only compare it from 20 reviews. Customer rating | – | – | – |
| Room size | |||
| The size of room the purifier suits, with the largest room the maker names for it. Room size | –up to 301 ft² | small roomsup to 53 ft² | medium roomsup to 259 ft² |
| Size, noise and age | |||
| How tall the purifier is. It decides whether it fits on a shelf or under a window sill. In this comparisonWhen it matters
Source
| 24.4 in (61.9 cm) | 10.4 in (26.4 cm) best | 18.9 in (48 cm) |
| The month the model first went on sale. It shows how old the technology in it is. On the market since | – | July 2023 | September 2026 |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
Sharp KI-N42 specifications
The numbers that matter first, then every fact by group. As published by the maker or the store we read it from.
Also sold or tested as: KIN42EUL (Europe) source
Consumables: The filter lasts about 120 months.
Cleaning performance 1 fact
- Room size the maker claims
Among the models we track
301 ft² (28 m²) on this model
Lowest
43 ft² (4 m²) Highest
2,800 ft² (260 m²) Middle
499 ft² (46 m²)Lower than 161 of the 222 models we track.
Source: Manual · checked on Oct 26
The room size the maker states. Makers use different rules, so we show it but never rank on it.
- 301 ft² (28 m²)
Filter 2 facts
- HEPA filter class
When it matters
- Allergy to pollen, dust mites or pet dander.
- Fine dust from traffic, wood stoves or wildfire smoke.
- For smells alone the particle filter’s class decides little: the carbon filter does that work.
Source: Manual · checked on Oct 26
How fine the filter is. True HEPA and H13 catch at least 99.97% of particles at 0.3 microns. HEPA-type is a weaker claim with no test behind it.
- Not stated
- Activated carbon filter
185 of the 189 models we track have this.
When it matters
- Cooking smells, smoke and pet odors.
- Gases from new furniture, paint or cleaning products.
- Against pollen and dust alone it adds nothing.
Source: Manual · checked on Oct 26
A filter of activated carbon that takes out smells and some gases. It does not catch particles.
- yes
Running costs 1 fact
- Filter life
Among the models we track
120 months on this model
Lowest
2 months Highest
120 months Middle
9 monthsHigher than 127 of the 128 models we track.
When it matters
- Running the purifier day and night, all year.
- Comparing what two models cost to own, since filters are bought again and again.
- Used only a few weeks a year, the filter’s price matters more than its stated life.
Source: sharpsklep.pl · checked on Oct 26
How long the maker says a filter lasts, in months of normal use. A filter that is spent cleans less.
- 120 months
Noise and power 4 facts
- Noise at the lowest speed
Among the models we track
17 dB on this model
Lowest
10 dB Highest
50 dB Middle
25 dBLower than 159 of the 176 models we track.
When it matters
- A bedroom, where it runs while you sleep.
- A home office or a quiet room where it runs all day.
- In a busy living room with the TV on you will hardly hear the low setting.
Source: Manual · checked on Oct 26
The sound level at the lowest speed, as the maker measures it.
- 17 dB
- Noise at the highest speed
Among the models we track
46 dB on this model
Lowest
30 dB Highest
70 dB Middle
54 dBLower than 170 of the 195 models we track.
When it matters
- Clearing the air fast, which needs the top speed.
- Open-plan spaces where sound carries.
- If you only run it on its low settings the top figure hardly matters.
Source: Manual · checked on Oct 26
The sound level at the highest speed, as the maker measures it.
- 46 dB
- Power at the highest speed
Among the models we track
30 W on this model
Lowest
1.5 W Highest
2,200 W Middle
42.5 WLower than 150 of the 208 models we track.
Source: Manual · checked on Oct 26
The power the purifier draws at its highest speed.
- 30 W
- Power on standby
Among the models we track
1.3 W on this model
Lowest
0 W Highest
1.3 W Middle
0.7 WHigher than 8 of the 9 models we track.
When it matters
- Leaving it plugged in all year.
- High electricity prices.
- A watt or less costs next to nothing over a year.
Source: sharpsklep.pl · checked on Oct 26
What the purifier draws when it is switched off but still plugged in, or waiting for the app.
- 1.3 W
Air quality sensing 2 facts
- Air quality sensors
When it matters
- Leaving the purifier on auto all day.
- Wanting to see the air quality in the app.
- If you set the speed yourself, a sensor adds little.
Source: Manual · checked on Oct 26
What the purifier measures in the air. A particle sensor lets it speed up and slow down by itself.
- PM2.5, Temperature, Humidity
- Automatic mode
154 of the 161 models we track have this.
When it matters
- Leaving it on all day without touching it.
- Air that changes during the day, from cooking, traffic or open windows.
- If you set the speed yourself each time, you will not miss it.
Source: Manual · checked on Oct 26
The fan speed follows the air quality the sensor reads.
- yes
Smart features and warranty 1 fact
- App control
When it matters
- Switching it on before you come home.
- Seeing the air quality and the filter’s state at a glance.
- If it stands on auto in one room, you will rarely open the app.
Source: Manual · checked on Oct 26
Whether you can control the purifier from a phone app, over wifi or only nearby over Bluetooth.
- Wi-Fi
Build 5 facts
- Also works as
When it matters
- A room that also needs cooling, heating or more humid air.
- Not wanting a second device in a small room.
- If you only need clean air, extras add to the price, not to the use.
Source: Manual · checked on Oct 26
What the purifier does besides cleaning the air, such as cooling as a fan, heating or humidifying.
- Humidifier
- Height
Among the models we track
24.4 in (61.9 cm) on this model
Lowest
1.6 in (4 cm) Highest
50 in (127 cm) Middle
19.8 in (50.2 cm)Higher than 141 of the 182 models we track.
When it matters
- A shelf, a sideboard or a spot under a window sill.
- A small room where a tall tower would stand in the way.
- On an open floor with room to spare it decides little.
Source: Manual · checked on Oct 26
How tall the purifier is. It decides whether it fits on a shelf or under a window sill.
- 24.4 in (61.9 cm)
- Width
Among the models we track
384 mm on this model
Lowest
75 mm Highest
544 mm Middle
280 mmHigher than 133 of the 161 models we track.
When it matters
- A corner, a niche or a narrow gap beside furniture.
- A small room where floor space is scarce.
- On an open floor it decides little.
Source: Manual · checked on Oct 26
How wide the purifier is. With its depth it decides how much floor it takes up.
- 384 mm
- Depth
Among the models we track
230 mm on this model
Lowest
75 mm Highest
500 mm Middle
238 mmLower than 86 of the 159 models we track.
Source: Manual · checked on Oct 26
How deep the purifier is, front to back.
- 230 mm
- Weight
Among the models we track
18.1 lb (8.2 kg) on this model
Lowest
0.7 lb (0.33 kg) Highest
169.8 lb (77 kg) Middle
11.7 lb (5.3 kg)Higher than 174 of the 218 models we track.
When it matters
- Moving the purifier from room to room, up and down the stairs.
- A shelf or a table that has to bear it.
- If it stays in one place it hardly matters.
Source: Manual · checked on Oct 26
What the purifier weighs. It counts most if you move it from room to room.
- 18.1 lb (8.2 kg)
Warranty and certification 2 facts
- Warranty
Among the models we track
2 years on this model
Lowest
1 year Highest
5 years Middle
2 yearsLower than 21 of the 118 models we track.
When it matters
- A robot with a dock full of pumps and moving parts, where more can break.
- An expensive robot you plan to keep for years.
- For a cheap robot you would replace rather than repair, the extra years count for less.
Source: sharpsklep.pl · checked on Oct 26
The warranty the maker gives in the United States.
- 2 years
- Maker model numbers
- KI-N42EU-L
Sources: Manual · sharpsklep.pl
The maker
Sharp
- Headquarters: Japan
- Founded in 1912
- Owned by Hon Hai Precision Industry Co., Ltd., Taiwan
Sharp is a brand of Sharp Corporation, a Japanese electronics maker with its head office in Osaka, whose parent company is Hon Hai Precision Industry of Taiwan. In Europe its consumer products, among them air purifiers, dehumidifiers and portable air conditioners, are sold through Sharp Consumer Electronics Poland, which runs the brand's European consumer websites.