Tag: airvana

Smart Air Purifier in India: What App, Alexa and Google Home Features Actually Matter

A smart air purifier is one that measures your air accurately and acts on it without you: a laser particle sensor with a numeric PM2.5 readout, an Auto mode that responds quickly, scheduling, and an app that shows trends. Wi-Fi and voice control are useful on top of that, but they are not what makes a purifier smart. A connected purifier with a poor sensor is just a remote-controlled fan.

What Smart Should Mean

The word “smart” is used for anything with Wi-Fi. A more useful test is whether the purifier makes better decisions than you would by hand. That depends on three things, in this order:

Sensing: does it know what is in the air, and how much?
Control: does it act on that reading sensibly, speeding up fast and slowing down once the room is clean?
Connection: can you see, schedule and automate it from your phone or voice assistant?

Most buyers compare the third and ignore the first two. Reverse that order. The CADR and filter still do the actual cleaning, so a smart purifier must also be correctly sized; see the air purifier features that matter for the basics.

Sensors: Which Parameters Matter

Parameter	What it tells you	How useful at home
PM2.5	Fine particles that reach deep into the lungs; the main pollutant in Indian winter smog	Essential
PM10	Coarser dust, pollen-sized particles, construction dust	Very useful, especially in dusty cities
PM1.0	The finest particles, largely from combustion such as smoke and incense	Useful for smoke events
TVOC	Total volatile organic compounds: cooking fumes, cleaners, paints, agarbatti	Useful; shows when to ventilate
CO₂ or eCO₂	How stale a closed room is; eCO₂ is an estimate, not a direct measurement	Useful as a “time to open a window” signal
NO₂	A traffic and combustion gas	Useful for homes near busy roads

Two honest caveats. A purifier cannot remove CO₂; it can only tell you the room needs fresh air. And particle sensors measure particle size, not what the particles are, so no home sensor can tell pollen from dust. For more on reading these numbers, see how to check air quality at home.

Numeric Readout vs Colour Ring

A colour ring that turns from red to green is reassuring, but it hides the information you need. Green might mean a PM2.5 of 10 or of 50, which are very different against the WHO 24-hour guideline of 15 µg/m³ and India’s NAAQS 24-hour limit of 60 µg/m³. A numeric PM2.5 readout lets you check the purifier is doing its job: switch it on in a smoggy room and watch the number fall. It also tells you when the filter is tiring, because the number falls more slowly than it used to.

The quickest test of a smart purifier: does it show PM2.5 as a number, and does that number move when you light an agarbatti across the room?

Auto Mode and Scheduling

Auto mode is where sensing turns into clean air. A good Auto mode reacts within a few minutes to cooking or incense, then steps down once the room is clean, saving electricity and filter life. A poor one either reacts too late or runs loud all the time. Look for a setting that lets you choose an air-quality target rather than just “on”.

Scheduling covers the predictable parts of your day: switch on before you wake, turn on Sleep mode at bedtime, start before you get home. An energy-saving mode that pauses the fan when air is clean and restarts when it worsens helps on milder days.

Boon Airvana reads eight parameters every second, shows them as numbers, and works with the Boon app, Alexa, Google Home and Matter.

See Boon Airvana →

Alexa, Google Home and Matter

Voice control is a genuine convenience when your hands are full or you are already in bed. Check that the purifier works with the assistant you actually use. Matter is a newer smart-home standard designed so that devices from different makers work across platforms; support for it makes a purifier less likely to be stranded if you change ecosystems later. Routines are where it pays off: for example, switching the purifier to high when you say you are cooking.

Insights, Diagnostics and Gimmicks

Worth having: history charts that show when your air is worst (often evenings and early mornings in winter), filter-life tracking based on actual use, alerts that suggest an action (open a window, clean the pre-filter), and self-diagnostics that flag a sensor or motor fault before you notice it.

Usually gimmicks: animations and mood lighting sold as features, “AI” labels with no explanation of what is learned, health scores that cannot be traced back to a measured number, and claims to detect specific allergens. Some purifiers also cannot remove certain pollutants at all; what air purifiers cannot remove explains the limits.

Boon Airvana as an Example

Here is how Boon Airvana lines up against this list, using only its published specifications:

Sensing: the AtmoScan sensor reads PM1.0, PM2.5 and PM10 (laser-based), TVOC, eCO₂ (estimated), NO₂, temperature and humidity, every second.
Display: a full-colour display with watch faces for full metrics, AQI only, an AQI graph, and a High AQI alert screen.
Control: Auto mode follows real-time AQI; Sleep runs quietly through the night; Eco cycles off and on as AQI settles or rises. Four fan speeds, a timer and child lock.
Alerts: fresh air (eCO₂), cooking fume (TVOC), traffic pollution (NO₂), allergy (PM2.5 and PM10 rising), clean pre-filter and change filter. The allergy alert responds to particle levels; it does not identify pollen.
App: modes, scheduling, child lock, air-quality targets, Auto-learn (learns your routine and starts purifying before you get home), a diagnostics report, charts, trends and insight cards.
Connection: works with Amazon Alexa, Google Home and Matter, with continuous self-diagnostics on sensors, filters and motor.

Underneath the smart layer it has a 380 m³/h CADR and an H13 HEPA filter. What it will not do: remove carbon monoxide, add oxygen or tell you which pollen is in the room. Airvana is ₹14,900 at the time of writing.

Frequently Asked Questions

What makes an air purifier smart?

A smart air purifier measures the air accurately and acts on it by itself. That means a laser particle sensor with a numeric PM2.5 readout, an Auto mode that speeds up and slows down sensibly, scheduling, and an app with history and filter tracking. Wi-Fi and voice control add convenience, but without good sensing they do not make a purifier smart.

Do air purifiers work with Alexa and Google Home?

Many connected purifiers do, but not all, and support varies by model. Check the listing for the exact assistant you use. Matter support helps a purifier work across different smart-home platforms. Boon Airvana works with Amazon Alexa, Google Home and Matter, alongside the Boon app.

Is a PM2.5 number better than a colour indicator?

Yes. A colour ring groups a wide range of readings under one colour, so green could mean clean air or merely acceptable air. A numeric PM2.5 readout lets you compare against the WHO 24-hour guideline of 15 µg/m³, check the purifier is lowering the reading, and notice when the filter starts to tire.

Can a smart air purifier measure CO2?

Some include a true CO2 sensor and others show eCO2, an estimate rather than a direct measurement. Either way, a purifier cannot remove CO2. The reading is useful as a signal that a closed room has gone stale and needs fresh outdoor air, which you get by opening a window when the outdoor AQI allows.

Is an app-controlled air purifier worth the extra cost?

It is if the app does useful work: scheduling, remote start before you get home, air-quality targets, filter-life tracking and charts that show when your air is worst. It is not if the app only duplicates the buttons on the machine. Never trade CADR or filter quality for an app.

Can an air purifier sensor detect pollen?

No home particle sensor can identify pollen. Sensors measure particle size, such as PM2.5 and PM10, not what the particles are. A rise in coarse particles during pollen season may include pollen, but it could also be dust. If allergy symptoms persist despite clean readings, see a doctor for testing.

Boon Airvana: eight-parameter AtmoScan sensing, numeric display, the Boon app, Alexa, Google Home and Matter. ₹14,900 at the time of writing.

See Boon Airvana →

October 16, 2026

H13 vs H14 HEPA Filter: Which Grade Do Indian Homes Need?

For a home air purifier, H13 HEPA is enough. H13 captures at least 99.95% of particles at their most penetrating size, and H14 captures at least 99.995%. That gap is real in a hospital cleanroom, but in a living room the purifier’s CADR, the filter’s seal and how closed your room is make a far bigger difference to the air you breathe.

HEPA Grades Under EN 1822

Most HEPA grades on purifier boxes come from the European standard EN 1822. It tests filters at the Most Penetrating Particle Size (MPPS), the particle size that slips through a given filter most easily, typically somewhere around 0.1 to 0.3 microns. Larger and smaller particles are both caught more easily than the MPPS, so the rating is a worst case.

Class	Group	Minimum efficiency at MPPS	Particles let through, per 10,000
E10	EPA	85%	Up to 1,500
E11	EPA	95%	Up to 500
E12	EPA	99.5%	Up to 50
H13	HEPA	99.95%	Up to 5
H14	HEPA	99.995%	Up to 0.5

Classes E10 to E12 are EPA (Efficient Particulate Air) filters, not HEPA. Only H13 and H14 are HEPA under the current standard. Grades above H14 (the U classes) are for cleanrooms and are not relevant to homes.

True HEPA vs HEPA-Type

True HEPA is a marketing phrase, not a grade, but it usually signals a filter tested to a HEPA standard. The phrase is common on products built to a US definition of HEPA, which specifies 99.97% capture at 0.3 microns. In practice, a filter labelled H13 under EN 1822 tells you more, because it names the standard and the class.

HEPA-type, HEPA-like or HEPA-style means the media looks similar but is not graded to a HEPA standard. It may capture far fewer fine particles. Treat it as a red flag.

The H11 and H12 caveat. An older version of EN 1822 used H10, H11 and H12 for what are now E10, E11 and E12. Some listings still use the old names, so “H12 HEPA” today is, in the current standard’s terms, an E12 EPA filter. That is not necessarily bad, but it is not the same as H13, and the name can make it sound closer than it is. For how HEPA compares with ionisers and UV, see HEPA vs ioniser vs UV comparison.

H13 vs H14: The Real Difference

On paper, H14 lets through one-tenth as many MPPS particles as H13. In a single pass, H13 lets through up to 5 in every 10,000; H14 up to 0.5. Both are excellent.

Inside a home, air passes through the purifier again and again. At four or five air changes an hour, room air is filtered many times over, so the tiny per-pass difference between H13 and H14 shrinks further in the air you actually breathe. Meanwhile H14 media is denser, which can mean more resistance to airflow. Unless the fan is designed for it, a denser filter can deliver less clean air per hour, or need more fan power and noise to deliver the same.

The practical ranking for a home purifier: enough CADR for the room, then a well-sealed filter, then the HEPA grade. H13 in a correctly sized, sealed purifier beats H14 in an undersized or leaky one.

Why CADR and Seal Matter More

CADR measures the clean air a purifier actually delivers, combining airflow and filter efficiency. A purifier with too little airflow for the room will clean it slowly, whatever its grade. Work out what your room needs with the air purifier size calculator, and read the air purifier size guide for the method.

Seal and bypass. If even a small share of air leaks around the edge of the filter, it is not filtered at all, and that leak can matter far more than the difference between 99.95% and 99.995%. Look for a filter that seats firmly against a gasket. Replace it with the correct filter for the model, because a loose third-party filter can undo a good machine.

Find the CADR your room needs before you compare filter grades.

Size Your Room →

Is H13 Enough for North Indian Winters?

Yes, for homes. In Delhi-NCR and much of the Indo-Gangetic plain, winter PM2.5 often sits far above India’s NAAQS 24-hour limit of 60 µg/m³ and the WHO 24-hour guideline of 15 µg/m³, with AQI regularly in the Poor to Severe bands. The challenge in those months is volume: outdoor air keeps leaking in, and the purifier must clean faster than it arrives. That is a job for CADR and a closed room, not a higher filter grade.

What helps most on bad days: size for four to five air changes an hour, keep doors and windows shut while the purifier runs, clean the pre-filter more often, and replace the HEPA filter when the purifier says it is due. If anyone at home has persistent breathlessness, chest tightness or a worsening cough during smog season, see a doctor; a purifier reduces exposure but does not treat illness.

Where Activated Carbon Fits

HEPA catches particles, not gases. Cooking fumes, smells and some volatile organic compounds pass straight through it. That is the job of activated carbon, which adsorbs odours and some gases. It is not a fix for every gas: no home purifier removes carbon monoxide, and a purifier does not add oxygen. Our guide on what air purifiers cannot remove covers those limits. Carbon also fills up over time, so the filter change reminder matters for it as much as for the HEPA layer; see air purifier maintenance and filter care.

Boon Airvana uses an H13 HEPA filter (99.95% of particles in a single pass) with a washable pre-filter, activated carbon and an anti-bacterial coating, in a dual-suction design that draws air through two filters. Its CADR is 380 m³/h, and it reminds you when the filter is due based on the air it has cleaned. It is ₹14,900 at the time of writing.

Frequently Asked Questions

Is H14 better than H13 for a home air purifier?

H14 captures more particles per pass, at least 99.995% against 99.95% at the most penetrating particle size. In a home, though, air passes through the purifier many times an hour, so the difference in the air you breathe is small. CADR, a good filter seal and a closed room matter more. H13 is enough for homes.

What does H13 HEPA mean?

H13 is a filter class under the European standard EN 1822. An H13 filter captures at least 99.95% of particles at the most penetrating particle size, the size that gets through most easily, typically around 0.1 to 0.3 microns. It is a common HEPA grade in well-built home air purifiers.

Is H12 HEPA as good as H13?

Not quite. Under the current version of EN 1822, the class once called H12 is named E12 and grouped as EPA, not HEPA, with at least 99.5% capture against 99.95% for H13. That is still effective filtration, but if a listing calls an H12 filter HEPA, it is using an older name. Compare CADR as well as grade.

What is the difference between true HEPA and HEPA-type?

True HEPA usually means a filter tested to a HEPA standard. HEPA-type or HEPA-like means the media resembles HEPA but is not graded to any HEPA standard, and it may capture far fewer fine particles such as PM2.5. Look for a named grade like H13 rather than descriptive phrases.

Is H13 HEPA enough for Delhi pollution?

Yes, for homes. During Delhi winters the challenge is the amount of polluted air leaking in, not the filter grade. Choose a purifier with enough CADR for four to five air changes an hour, keep the room closed while it runs, clean the pre-filter regularly and change the filter when it is due.

Does a HEPA filter remove gases and smells?

No. HEPA captures particles, not gases. Odours, cooking fumes and some volatile organic compounds need an activated carbon layer, which adsorbs them until it fills up. Even carbon does not remove every gas. No home purifier removes carbon monoxide, and purifiers do not add oxygen to a room.

Boon Airvana pairs an H13 HEPA filter and activated carbon with a 380 m³/h CADR. ₹14,900 at the time of writing.

See Boon Airvana →

October 16, 2026

How to Choose an Air Purifier for Home in India: A Complete Decision Framework

To choose an air purifier for home, start with the room: work out the CADR it needs, then insist on a true HEPA filter in a sealed housing, a sensor that shows real numbers, and a running cost you can live with. Smart features and design come last. Follow the five steps below in order and most models eliminate themselves.

Step 1: Room Size and CADR

CADR, Clean Air Delivery Rate, is how many cubic metres of clean air a purifier delivers every hour. It is the single number that decides whether a purifier will make a difference you can feel. Everything else on the box is secondary.

To find what your room needs, multiply floor area by ceiling height to get the volume, then multiply by the number of air changes per hour (ACH) you want. For Indian winters, aim for about four to five air changes an hour in a bedroom. A 12 × 12 ft bedroom with a 3 m ceiling holds about 40 m³, so it needs roughly 160 to 200 m³/h.

Measure the room you will actually use it in, not the one you hope it will cover. If you plan to move it between rooms, size it for the largest. The air purifier size calculator does the arithmetic in a few seconds.

Not sure what CADR your room needs? Enter its size and get a number in seconds.

Size Your Room →

Step 2: Filter Grade and Seal

A true HEPA filter is the part that captures fine particles such as PM2.5. Look for a named grade; H13 is the common standard in home purifiers. Avoid “HEPA-type” or “HEPA-like” media, which is not graded to a HEPA standard.

Two things matter as much as the grade. First, the seal: air that leaks around the filter is not cleaned. Second, activated carbon: a layer of carbon helps with cooking smells and some gases, which HEPA cannot catch. More carbon generally helps more; a token dusting does little. A washable pre-filter that catches hair and large dust is a welcome bonus because it protects the HEPA layer.

Step 3: Sensor Quality

The sensor decides when the fan speeds up and slows down. A good one makes Auto mode useful; a poor one makes it either lazy or noisy.

Laser particle sensors count particles by size and can show PM2.5 as a number. They are the better choice.
Infrared sensors are cheaper and coarser, and are usually paired with a colour light rather than a number.
A numeric display lets you check the purifier is working: watch PM2.5 fall after you switch it on. A colour ring alone tells you very little.

Gas sensors (TVOC, NO₂, estimated CO₂) are useful extras for kitchens and homes near traffic, not essentials. The trade-offs are covered in the air purifier features that matter.

Step 4: Smart Features Worth Having

App control earns its place if it does something you would otherwise do by hand: scheduling, remote start before you get home, filter-life tracking, and history charts that show when your air is worst. Voice control through Alexa or Google Home is a convenience. A child lock matters if you have small children. Features that only add colours or animations are design choices, not air cleaning.

Step 5: Noise, Running Cost and Service

Noise. A purifier in a bedroom runs all night, so noise decides whether you keep it on. Check the stated noise figure in dB at the lowest speed or Sleep mode, and be wary of listings that give no figure. A purifier with plenty of CADR can run at a lower, quieter speed and still keep up. For how air and sleep connect, see bedroom air quality and sleep.

Running cost. Replacement filters are usually the larger running cost, then electricity. Look up the current filter price for the exact model, and prefer a unit with an Auto or Eco mode that slows down once the room is clean. The full sums are in our guide to air purifier running cost in India.

Filters and service. Before you buy, confirm that replacement filters are listed and in stock, and that someone will answer if the unit develops a fault. A purifier you cannot get a filter for is a fan. Good habits after purchase are covered in air purifier maintenance and filter care.

In one line: right CADR, sealed true HEPA, a sensor that shows numbers, a quiet night mode and filters you can buy. Everything else is a tie-breaker.

The Checklist

Check	What good looks like	Red flag
CADR	Stated in m³/h, enough for 4 to 5 ACH in your room	Coverage in sq ft only
Filter grade	True HEPA with a named grade, such as H13	“HEPA-type”, “HEPA-like”
Seal	Filter seats firmly with a gasket	Loose filter, visible gaps
Carbon	A real activated-carbon layer	No carbon, or carbon not mentioned
Sensor	Laser particle sensor, numeric PM2.5	Colour light only
Auto mode	Fan responds within minutes to cooking or incense	Stays on one speed regardless
Night noise	Stated dB figure at the lowest speed	No noise figure given
Ozone	No ioniser, or one you can switch off	Always-on ioniser or “plasma”
Filters	Listed, in stock, price known	Not available to buy
Service	A clear way to reach the brand	Marketplace seller only

If you or a family member has breathing difficulty, chest tightness or a cough that does not settle, see a doctor. A purifier reduces exposure to particles; it does not treat a condition.

A Worked Example: Boon Airvana

Here is how Boon Airvana reads against the framework, using only its published specifications:

CADR: 380 m³/h. About 484 sq ft at a 3 m ceiling (around 2.8 air changes an hour), and more than nine air changes an hour in a 12 × 12 ft bedroom.
Filter: dual suction through two filters, with a washable pre-filter mesh, H13 HEPA, activated carbon and an anti-bacterial coating on the filter.
Sensor: AtmoScan reads PM1.0, PM2.5 and PM10 (laser-based), plus TVOC, estimated CO₂, NO₂, temperature and humidity every second, shown as numbers on a full-colour display.
Modes: Auto, Sleep and Eco, four fan speeds, a timer and a child lock.
Smart: the Boon app adds scheduling, air-quality targets, Auto-learn, a diagnostics report and trend charts, and works with Alexa, Google Home and Matter.
Filters: a change-filter reminder based on the air it has cleaned; the pre-filter is washable.

Where it does not fit: a hall much larger than about 484 sq ft is better served by two units placed apart, and no purifier helps with carbon monoxide. Airvana is ₹14,900 at the time of writing.

Frequently Asked Questions

How do I choose an air purifier for my home?

Start with the room. Multiply floor area by ceiling height and by four to five air changes an hour to get the CADR you need. Then insist on a true HEPA filter, ideally H13, in a sealed housing, plus activated carbon. After that, compare sensor quality, night-time noise, running cost and filter availability. Smart features are tie-breakers, not reasons to buy.

What size air purifier do I need for my room?

Size by CADR, not by the coverage claim on the box. Room volume in cubic metres multiplied by the air changes per hour you want gives the CADR in m³/h. A 12 by 12 ft bedroom with a 3 m ceiling needs roughly 160 to 200 m³/h for four to five air changes an hour. The Boon size calculator does this for any room.

Is one air purifier enough for the whole house?

Usually not. A purifier cleans the room it is in, and walls and doors limit how far its airflow reaches. Put one in the room where you spend the most hours, which for most families is the bedroom at night. Add a second for the living room if needed, rather than buying one large unit and expecting it to reach every room.

Which matters more, CADR or HEPA grade?

CADR, for most homes. A sealed H13 filter in a purifier with too little airflow will clean a room slowly, while a correctly sized unit with a good HEPA filter cleans it fast. The filter grade sets how much is caught per pass; CADR sets how often the room’s air passes through. You need both, but size first.

How quiet should an air purifier be for a bedroom?

Check the stated noise figure in dB at the lowest speed or in Sleep mode, and compare models on that number. Be cautious with listings that give no figure. A purifier with more CADR than the room strictly needs can run at a lower, quieter speed through the night and still keep the air clean.

Should I buy an air purifier with an app?

An app is worth having if it does useful work: scheduling, starting the purifier remotely before you get home, tracking filter life and showing when your air is worst. It does not make the air cleaner by itself. If the choice is between a better filter and fan or an app, choose the better filter and fan.

See how Boon Airvana measures up on CADR, filtration and sensing, ₹14,900 at the time of writing.

See Boon Airvana →

October 16, 2026

Best Air Purifier Under ₹15,000 in India: What Each Budget Actually Buys

Under ₹15,000 you can buy a genuinely effective air purifier for an Indian bedroom or a mid-sized living room, provided it has a stated CADR that matches your room, a true HEPA filter and a sealed design. What changes as the budget rises is mostly coverage, sensor quality and smart features, not whether the machine cleans air. Spend on CADR and filter first, extras last.

The Short Answer

Price in this category tracks three things: how much air the fan can push through the filter every hour (CADR), how good the sensor is that decides when to speed up, and how much convenience sits on top (app, display, voice control). The filter technology itself, HEPA media plus activated carbon, is broadly similar across budgets. That is good news: a careful buyer at ₹10,000 can end up with cleaner air than a careless buyer at ₹15,000 who bought a unit too small for the room.

Rule of thumb: pick the budget that buys enough CADR for your room first. Every other feature is a tie-breaker.

What ₹8,000, ₹10,000 and ₹15,000 Buy

The tiers below describe what is typical in the Indian market, not any particular model. Treat them as a map, then check each listing against the rules further down.

Budget	Typical coverage	Filter	Sensor and display	Who it suits
Around ₹8,000	Compact units sized for a small bedroom or study	HEPA (check the grade), often thin carbon	Often none, or a colour light only	One small closed room, a single sleeper
Around ₹10,000	Standard bedrooms; some reach small living rooms	HEPA, usually H13 claimed, modest carbon	Basic particle sensor, colour ring or simple PM2.5 number	A typical 12 × 12 ft bedroom
Around ₹15,000	Large bedrooms and mid-sized living rooms	H13 HEPA, more carbon, sometimes dual filters	Laser particle sensor with numeric PM2.5, sometimes gas sensors and an app	A family room or a bedroom you want cleaned fast

The biggest jump between tiers is usually airflow. A small bedroom needs much less CADR than a 400 sq ft living room, and a bigger fan, bigger filter and better sealing cost money. If your room is small, the lower tier may be all you need. If your room is large, a cheap unit simply cannot move enough air, however good its filter. Our air purifier size guide explains the arithmetic, and the air purifier size calculator does it for you.

What Never to Compromise On

Some features are nice to have. These four are not optional at any budget:

A stated CADR in m³/h. Clean Air Delivery Rate is the only number that tells you how fast a purifier cleans a room. A listing without it is asking you to trust a coverage claim instead.
True HEPA, ideally H13. HEPA media is what captures fine PM2.5. Grade matters less than airflow, but it should be a named HEPA grade, not a vague description.
A sealed filter housing. If air can leak around the filter, the filter grade is irrelevant. Look for a filter that seats firmly with a gasket, not one that rattles in a slot.
Replacement filters you can actually buy. A purifier without a filter supply becomes a fan within a year. Check that the exact filter is listed and in stock before you buy the machine.

Sensors, displays and apps are where you can trade down. A unit with no sensor still cleans air on a fixed speed; you just have to run it sensibly yourself. For what each extra is worth, see the air purifier features that matter.

Red Flags in Budget Listings

“HEPA-type” or “HEPA-like”. These phrases describe media that looks like HEPA but is not tested to a HEPA grade. It may capture far fewer fine particles.
Coverage in sq ft with no CADR. “Covers up to 600 sq ft” means nothing without the CADR and the air-change rate it assumes. Many coverage claims assume one air change an hour or less, which is too slow for Indian winter smog.
Ionisers or “plasma” that cannot be switched off. Some ionisers produce ozone, a lung irritant. A purifier should remove pollutants, not add one. Our HEPA vs ioniser vs UV comparison covers why HEPA is the safer core technology.
“Removes 99.99% of viruses” with no test basis. Big percentages without a stated standard, particle size or test method are marketing, not data.
Very cheap filters from unknown sellers. An ill-fitting filter undoes a good machine.

Boon Airvana pairs a 380 m³/h CADR with an H13 HEPA filter and a laser-based sensor that shows the actual PM2.5 number. ₹14,900 at the time of writing.

See Boon Airvana →

The Price Tag Is Not the Cost

Over three years, replacement filters and electricity can add up to a meaningful share of what you paid for the machine. Two units at the same price can cost very different amounts to own, depending on filter price, how often the filter needs changing in your city’s air, and how the fan behaves when the air is already clean. A unit with a good Auto or Eco mode that slows down once the room is clean will usually use less electricity and wear its filter more slowly than one left on high all day.

Before you buy, look up the current filter price for the exact model and estimate how many you will need. Our breakdown of air purifier running cost in India walks through the sums.

Where Boon Airvana Sits

Boon Airvana is ₹14,900 at the time of writing, at the top of this budget. Here is what that buys, stated plainly:

CADR 380 m³/h. About 484 sq ft at a 3 m ceiling and roughly 2.8 air changes an hour; a 12 × 12 ft bedroom gets more than nine air changes an hour.
Dual suction through two filters. Air is drawn in from both sides.
Four stages: washable pre-filter mesh, H13 HEPA, activated carbon for odours and gases, and an anti-bacterial coating on the filter.
AtmoScan sensor reading PM1.0, PM2.5 and PM10 (laser-based), plus TVOC, estimated CO₂, NO₂, temperature and humidity, every second, shown as numbers on a full-colour display.
Auto, Sleep and Eco modes, four fan speeds, a timer, child lock, and the Boon app with Alexa, Google Home and Matter support.
Filter change by reminder, based on the air the unit has actually cleaned, not a fixed calendar.

When Airvana is not the right buy: if your budget is closer to ₹8,000 and you need to clean one small bedroom, a well-sealed compact HEPA unit with a stated CADR will do that job. If your hall is much larger than about 484 sq ft, two units placed apart will do better than any single purifier in this price range. And no purifier, ours included, removes carbon monoxide.

Frequently Asked Questions

Which is the best air purifier under ₹15,000 in India?

There is no single best model; the best one for you is the one whose CADR matches your room. Under ₹15,000, look for a stated CADR in m³/h, a true H13 HEPA filter, a sealed filter housing, and replacement filters that are in stock. A numeric PM2.5 display and a good Auto mode are worthwhile extras. Avoid HEPA-type filters and coverage claims without CADR.

Is an air purifier under ₹10,000 worth buying?

Yes, for a small or standard bedroom, if it has a stated CADR that suits the room and a true HEPA filter. At this budget you usually give up sensor quality, a numeric display and app control, not filtration. It will not be enough for a large living room. Check the replacement filter price before buying, because that is part of what you really pay.

What CADR do I need for a bedroom?

A 12 by 12 ft bedroom with a 3 m ceiling holds about 40 cubic metres of air. For four to five air changes an hour, which suits smoggy Indian winters, you need roughly 160 to 200 m³/h of CADR. More CADR cleans the room faster and lets the purifier run at a quieter, lower speed. The Boon size calculator works this out for any room.

Is HEPA-type the same as true HEPA?

No. HEPA-type, HEPA-like or HEPA-style media resembles HEPA but is not tested and graded to a HEPA standard, so it may capture far fewer of the fine PM2.5 particles that matter most in Indian cities. A true HEPA filter states its grade, such as H13. If a budget listing avoids naming the grade, treat that as a warning.

Are ionisers in cheap air purifiers safe?

Some ionisers and plasma features produce small amounts of ozone, which irritates the lungs, and they do not remove particles the way a HEPA filter does. If a purifier has an ioniser, you should be able to switch it off. A purifier built around HEPA and activated carbon does not need one to clean the air.

How much does it cost to run an air purifier under ₹15,000?

Running cost has two parts: electricity and replacement filters. Filters are usually the bigger share, and their price and lifespan vary by model and by how polluted your air is. A unit with a good Auto or Eco mode slows down once the room is clean, which saves power and filter life. Always check the current filter price for the exact model before buying.

Boon Airvana: 380 m³/h CADR, H13 HEPA, an eight-parameter sensor and the Boon app, ₹14,900 at the time of writing.

See Boon Airvana →

October 16, 2026

Air Purifier for a Large Room or Living Room: How to Size It Properly

A large room needs a purifier sized by CADR, not by the coverage figure on the box. For a living room or hall, aim for at least three and ideally four to five air changes an hour: at a 3 m ceiling that is roughly 375 to 625 m³/h for a 450 sq ft room. Beyond about 500 sq ft, two units placed apart usually work better than one big one.

Why Coverage Claims Mislead

“Covers up to 700 sq ft” sounds like a promise. It is really a calculation with two hidden assumptions: the ceiling height, and how many times an hour the purifier is expected to clean the room’s air. Some coverage claims assume one air change an hour or less. That might keep a room tidy on a clean day; it will not keep up with Indian winter smog, cooking, incense or a door that opens every few minutes.

The honest number is CADR, in m³/h. With CADR and your room’s size you can work out the real result yourself. Our air purifier size guide covers the basics for bedrooms; this guide is about the bigger, more open spaces where most buyers under-size.

Air Changes per Hour, Explained

Air changes per hour (ACH) is how many times the purifier passes a room’s full volume of air through its filter each hour. The formula is simple:

CADR (m³/h) = floor area (m²) × ceiling height (m) × ACH. To convert, 1 sq ft = 0.0929 m².

As a guide for Indian homes:

About 3 ACH: a reasonable floor for a living room on moderate days.
4 to 5 ACH: what you want during smoggy months, when AQI sits in the Poor to Severe bands, or in homes with allergy sufferers.
Below 2 ACH: the purifier is fighting a losing battle against every door opening and gap under the balcony door.

Worked Examples: 300, 450 and 600 sq ft

All three assume a 3 m (about 10 ft) ceiling. If your ceiling is lower, the numbers come down in proportion.

Room	Area	Volume	3 ACH	4 ACH	5 ACH
300 sq ft (large bedroom, small living room)	27.9 m²	83.6 m³	251 m³/h	334 m³/h	418 m³/h
450 sq ft (typical living-dining)	41.8 m²	125.4 m³	376 m³/h	502 m³/h	627 m³/h
600 sq ft (open-plan hall)	55.7 m²	167.2 m³	502 m³/h	669 m³/h	836 m³/h

Take the 450 sq ft row: 450 × 0.0929 = 41.8 m²; × 3 m = 125.4 m³; × 4 ACH = about 502 m³/h. A purifier rated at 250 m³/h would manage only two air changes an hour in that room, whatever its box says about coverage.

Two practical notes. First, CADR is measured at the highest fan speed, and few people run a purifier on maximum all evening. Some headroom lets the purifier keep up at a lower, quieter speed. Second, a double-height ceiling or a room open to a staircase adds volume that the floor area hides.

Enter your room’s length, width and ceiling height to get the CADR it needs.

Size Your Room →

When Two Units Beat One

A single purifier cleans air best close to itself. In a large or L-shaped room, the far end can lag behind, especially where furniture, a dining table or a partition breaks up the airflow. Two units placed apart often clean the whole space more evenly than one bigger unit in a corner. Two units are usually the better choice when:

the space is larger than about 500 sq ft, or has a double-height section;
it is L-shaped or split into living and dining zones;
you want to move one unit into a bedroom at night and leave the other in the hall;
the room needs more CADR than any single unit in your budget offers.

One large unit can be simpler in a square, uncluttered room with one main seating area. Either way, add up the CADR of all units and check it against the table above.

Placement in Open-Plan Homes

Placement can matter as much as CADR in a big space. Keep the purifier off the wall so it can draw air freely, away from curtains that block the intake, and closer to where people sit than to the main door. If the kitchen opens into the hall, keep the purifier away from the cooktop itself; a chimney handles cooking fumes at source. Keep balcony doors and windows closed while it runs on bad-air days, or the purifier ends up cleaning the neighbourhood. Our guide on where to place an air purifier in an Indian home covers fans, ACs and sliding windows in detail.

Check your city’s current air on the AQI by city page; on Poor to Severe days, aim for the higher end of the ACH range.

Where Boon Airvana Fits

Boon Airvana has a CADR of 380 m³/h. At a 3 m ceiling that covers about 484 sq ft at roughly 2.8 air changes an hour. Against the worked examples:

300 sq ft: about 4.5 air changes an hour. A comfortable fit.
450 sq ft: about 3 air changes an hour. Adequate on moderate days; on the worst smog days, a second unit or a closed-off space helps.
600 sq ft: about 2.3 air changes an hour from one unit. Two Airvanas placed apart (760 m³/h combined) bring it to about 4.5.

Its dual-suction design draws air in from both sides, through two filters, which suits a purifier standing away from the wall in an open room. The AtmoScan sensor shows PM2.5 as a number, so you can see whether the far end of the room is keeping up when you move the unit. Airvana is ₹14,900 at the time of writing.

Frequently Asked Questions

What CADR do I need for a 450 sq ft living room?

At a 3 m ceiling, a 450 sq ft room holds about 125 cubic metres of air. For three air changes an hour you need about 376 m³/h of CADR; for four, about 502 m³/h; for five, about 627 m³/h. Aim for four to five during smoggy months. If one unit cannot reach that, two units placed apart can.

Can one air purifier clean a hall?

It can if its CADR is high enough for the hall’s volume and the space is reasonably open. In a hall larger than about 500 sq ft, or one that is L-shaped or split into living and dining zones, two units placed apart usually clean the space more evenly than one unit in a corner. Check combined CADR against the room’s needs.

Why does my air purifier not work in my living room?

The most common reason is that it is too small for the room, giving fewer than two or three air changes an hour. Other causes are open doors and windows, a unit pushed against a wall or behind a sofa, a clogged pre-filter, or a filter due for replacement. Check the PM2.5 reading in different parts of the room.

How many air changes per hour should an air purifier give?

For Indian homes, about three air changes an hour is a reasonable minimum for living rooms, and four to five is better during smoggy months or for allergy sufferers. Bedrooms are smaller, so most purifiers can reach five or more there. Below two air changes an hour, outdoor air leaking in can outpace the purifier.

Is it better to buy two small air purifiers or one big one?

For large, L-shaped or zoned spaces, two smaller units placed apart often clean more evenly than one big unit, and you can move one into a bedroom at night. For a square, open room with one seating area, one large unit is simpler. Either way, make sure the combined CADR meets what the room needs.

Does ceiling height affect air purifier size?

Yes. CADR needed is floor area multiplied by ceiling height multiplied by air changes per hour, so a higher ceiling means more air to clean. A 3 m ceiling needs 20 percent more CADR than a 2.5 m ceiling for the same floor area. Double-height living rooms or rooms open to a staircase need noticeably more.

Boon Airvana delivers 380 m³/h through dual-suction filters; for halls beyond about 484 sq ft, two placed apart do the job. ₹14,900 at the time of writing.

See Boon Airvana →

October 16, 2026