Genuinely quiet at night. We run it on the bedroom setting and forget it's there until the app shows it working harder during a bad-AQI evening.
HealthProtect™ 7740i
★★★★☆ 4.3 · 20 Google reviews for Clean Air StoreA quiet, powerful air purifier for rooms up to 674 sq ft. 3-year warranty. HEPASilent Ultra™.
₨ 120,000
✓ In stock
674 sq ftRoom coverage
Smoke 735 m³/h · Dust 675 m³/h · Pollen 735 m³/hCADRClean-air delivery rate
27 dB(A)Low-speed noiseQuiet enough to sleep near
3 yearsWarrantyBacked by the authorized dealer
Authorized Blueair dealerManufacturer warrantyOrder confirmed by phone
Blueair designs have earned international recognition over the years.
These awards recognise Blueair products across its wider range; they are not awards for every model sold on this page.
Real customer reviews
Bought this after my daughter's allergist recommended a HEPA purifier for her room. Covers the room and the hallway outside it comfortably.
Ordered ahead of the winter smog and it's been worth every rupee. The app notification when AQI spikes outside is the feature I didn't know I needed.
Does exactly what it says. Only reason it's not five stars is delivery took a day longer than promised, unit itself is excellent.
We ordered two for our office floor after staff kept complaining about the AC dust. Noticeably fresher air within a day, and the VAT invoice process was painless.
Was worried about coverage since our living room is fairly open-plan, but it keeps up fine even on the medium setting.
674 sq ftRoom coverage
675 m³/hDust CADR
27 to 55 dB(A)Noise
9 to 72 WPower
6-12 monthsFilter life
3 yearsWarranty
See the HealthProtect™ 7740i in action
Official Blueair videos.
Blueair HealthProtect air purifier
Set it up and look after it
Replacing the SmartFilter
Connecting to the Blueair app
Taking care of your air purifier
What the HealthProtect™ 7740i gives you
Room size
One purifier for a very large room
It is made for rooms up to 674 sq ft, like a big living room or an open hall. It cleans all the air in a room that size about every 12.5 minutes. Round outlets send air out in every direction, so clean air reaches every corner. CADR is the clean air it makes each hour: 675 m³/h for dust, 735 m³/h for pollen and 735 m³/h for smoke.
- 4.8 full air changes an hour in 674 sq ft
- 1,604 sq ft cleaned in 30 minutes
Quiet
Strong enough for a big room, quiet enough for the night
On the lowest speed it makes 27 dB(A), so you can run it beside your bed. HEPASilent Ultra charges the particles so they stick to the filter, which lets the fan work gently. Blueair says this gives 50% more clean air, uses 55% less energy and is 10% quieter than a true HEPA filter in the same unit.
- 27 dB(A) on low, 55 dB(A) on high
- Night mode schedule in the app
Low running cost
Costs about Rs 5 a day in electricity, like a ceiling fan
Leave it on without worrying about the bill. On full speed it uses 72 W and on low only 9 W. Run 8 hours a day on full speed, that is about Rs 164 a month. With the Rs 22,500 filter changed every 6 months, the total is about Rs 3,914 a month.
- 72 W on full speed, 9 W on low
- Rs 3,914 a month with the filter
Air quality display
See how clean your air is without a phone
A colour bar on the top goes from good to poor, so you can read the room at a glance. Next to it, numbers show the fine dust in the air (PM1, PM2.5 and PM10). Press Auto and the fan speeds up when the air gets dusty and slows down when it clears. The app and Alexa work too.
- 5-colour bar plus PM1, PM2.5 and PM10 numbers
- Wi-Fi, Blueair app and Alexa
GermShield
Keeps working on the filter even when it is switched off
On standby, GermShield watches the room and removes viruses and bacteria that have collected on the filters, using a low air draft and plasma charging. In Blueair lab tests HEPASilent Ultra removed 99% of bacteria on the filter material. It cleans the filter, it does not treat the air in the room.
- Works on standby, no button to press
- Blueair lab tests on the filter material
SmartFilter
One filter for dust, smoke and smells
The SmartFilter has a particle layer and an active carbon layer. Blueair says together they remove gas, odours, smoke and VOCs as well as dust. Two pre-filters catch large dust first, and you clean them with a dry cloth or a soft vacuum brush. The unit tells you when the filter is due.
- Change the filter every 6 to 12 months
- Replacement filter Rs 22,500, in stock
What it costs to run each month
Worked out at the highest fan speed, 8 hours a day. On Auto and the lower speeds it costs less.
Electricity
Rs 164
72 W x 8 hours x 30 days = 17.28 units, at the NEA household rate of Rs 9.50 a unit.
Filter
Rs 3,750
Genuine filter Rs 22,500 divided over 6 months. Many filters last longer.
Total
Rs 3,914
A month, in total. The filter is most of it, so the purifier itself is cheap to run.
Full specifications
Performance
- Room coverageThe room size it is rated for.
- 674 sq ft
- Dust CADRClean air delivered per hour, tested to AHAM standards.
- 675 m³/h
- FiltrationCaptures 99.97% of particles down to 0.1 micron.
- HEPASilent Ultra™ Technology
Noise and power
- Noise, lowest speedA soft whisper is about 30 dB.
- 27 dB(A)
- Noise, highest speed
- 55 dB(A)
- Power, lowest speed
- 9 W
- Power, highest speedUsed for the monthly cost above.
- 72 W
Filter and warranty
- Filter lifeDepends on how dusty your air is.
- 6-12 months
- WarrantyLocal warranty handled in Nepal.
- 3 years
Size and weight
- DimensionsWidth x depth x height.
- 85.5 × 34 × 34 cm
- Weight
- 19.2 kg
- Colour
- White
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Is the HealthProtect™ 7740i right for you?
The HealthProtect™ 7740i is part of Blueair's HealthProtect™ Series, rated for rooms up to 674 sq ft. 3-year warranty. HEPASilent Ultra™. GermShield™ on standby.
Which rooms it suits
Blueair rates it for rooms up to 674 sq ft. In a bigger room the air changes less often, so look at a larger model. In a smaller room you get more air changes an hour.
How it compares
If you're deciding between related models, see how the HealthProtect™ 7740i compares to the HealthProtect™ 7770i and the HealthProtect™ 7470i. Coverage, price and noise level are the main differences to weigh.
Warranty and support
The manufacturer warranty is 3 years, and every unit sold here comes through an authorized Blueair dealer with local delivery and after-sales support. See the full range of Blueair air purifiers in Nepal, or read our HEPA air purifier buying guide for how to size a purifier to your space.
Not sure the HealthProtect™ 7740i is the right fit?
Get a free 5-minute consultation with our air quality specialists. Tell us your room size and budget, and we'll help you pick the right model before you order, not after.
💬 Get a Free ConsultationQuestions about this model
Answers before you send an order request.
What room size is the HealthProtect 7740i for?
It is made for rooms up to 674 sq ft, like a large living room or an open-plan space. It cleans all the air in a room that size about every 12.5 minutes. In a bigger room it still works, just slower: Blueair says it cleans 1,604 sq ft in 30 minutes. In a smaller room you can run it on a lower speed and keep it quiet.
Is it quiet enough to run at night?
Yes. On the lowest speed it makes 27 dB(A), so you can keep it beside your bed. The highest speed is 55 dB(A). You can set a night mode schedule in the Blueair app, and Auto mode only raises the fan when the air needs it.
How much electricity does it use?
On full speed it uses 72 W, about the same as a ceiling fan, and on low only 9 W. Running 8 hours a day on full speed, 72 W x 8 hours x 30 days is 17.28 units, so the electricity costs about Rs 164 a month at Rs 9.50 a unit. Add the filter (Rs 22,500 every 6 months) and the total is about Rs 3,914 a month. Check your own bill with the electricity cost calculator.
How often do I change the filter, and what does it cost?
Blueair says every 6 to 12 months, depending on your air, and the unit tells you when it is due. The SmartFilter for the 7740i and 7770i is Rs 22,500 and we keep genuine filters in stock in Nepal. The two pre-filters need no replacing: clean them with a dry cloth or a soft vacuum brush.
What is the difference between the 7740i and the 7770i?
Only the display. The body, room size (674 sq ft), air flow, noise (27 to 55 dB(A)), filter and app are the same. The 7740i shows a 5-colour bar and PM1, PM2.5 and PM10 numbers. The HealthProtect 7770i has a full screen that also shows gases, temperature, humidity and how much filter life is left. See both in the HealthProtect series.