a graphic showing a woman pointing to big room air purifiers

Best Large Room Air Purifiers in Thailand 2024

by Karl von Luckwald / January 29, 2024

People living or working in large spaces have a harder time finding air purifiers. Most units are designed for areas between 20 and 40 sqm (215-430 sqft).

But don’t worry, there are a few air purifiers for large rooms available in Thailand.

So if you aim to purify the air in large spaces like offices, gyms, schools, or hospitals, keep reading—this info is tailor-made for you.

In this article, we’ll introduce you to a bunch of good air purifiers with the highest CADR.

Furthermore, we’ll briefly explain what to consider when purchasing strong air cleaners. This means we will

  • start with a summary of air purifiers we recommend
  • explain what to consider when buying air purifiers for big rooms
  • provide data-backed reviews of units available in Thailand

What Are The Best Air Purifiers for Large Rooms?

a large room air purifier in a cozy living room
Large room air purifiers should be used for spaces of 100 sqm and up

For those short on time, check out the two air purifiers below.

Hands down, these are the strongest and most cost-effective air purifiers available in the Thailand market. They are used by several embassies (Swiss, French, German) and offices (UNHCR). Both are easy to operate and most importantly: quiet!

Further in the article, we’ll provide in-depth reviews and show you more units.

covers 100 sqm

Blast Mini Air Purifier

The Blast Mini is a good choice for rooms up to 100 sqm (1080 sqft). It uses a HEPA filter to capture 99.95% of contaminants, including PM2.5, pet dander, smoke, and viruses. Many offices and hospitals in Asia use the Blast Mini to maintain clean and safe indoor environments.

covers 150 sqm

Blast Air Purifier

The Blast stands out as Thailand’s most powerful and quietest air purifier, ideal for large spaces up to 150 sqm (1615 sqft). It operates with a low noise level of just 43 dB, so it won’t disturb you. Its large HEPA filter, lasting up to 20 months, efficiently traps 99.95% of airborne pollutants. The Blast is a great choice for spacious homes, offices, and hospitals.

Transparency Note

Transparency is essential to us, and we want to empower you to make well-informed choices.

Our goal is to provide you with the knowledge you need to confidently navigate the air purifier market.

We aim to help you make a decision based on your understanding and needs, rather than being swayed by brand promotions, social media influencers, or even this article.

What to Consider When Buying Air Purifiers for Large Spaces

Room Size and CADR

When choosing air purifiers for big rooms your machine in question must be strong enough to keep up with your room size.

So make sure you have a good idea about the size of your space. Next, check the CADR ratings of the air purifier you’re considering.

CADR (Clean Air Delivery Rate) is every air purifier’s most important number as it gives you an accurate idea of how strong the machine is.

a screenshot of an air purifier listed on amazon highlighting the CADR rating
The CADR rating is the most important metric to evaluate air purifiers

The CADR rating is provided in either cubic meters per hour (m³/hr) or square feet per minute (sqft/min).

A higher CADR number indicates a more powerful air purifier.


To identify an air purifier that matches your room size, take a look at the CADR rating. A higher CADR indicates a more efficient air purifier in swiftly cleaning the air.

Here, we’ve gathered a list of recommended Clean Air Delivery Rates (CADR) for various room sizes to offer you better guidance.

For instance, if your room size falls within the 90-100 sqm (969-1076 sqft) range, you should seek air purifiers with a CADR between 700-800 (m³/hr).


I suggest keeping an eye on the noise levels.

Many brands boast about their air purifiers being super quiet, but this often refers to the lowest fan speed.

When you turn them up to the highest setting, which you may need during heavy pollution, most air purifiers can become quite noisy. So, be prepared for some noise.


Air purifiers that stay below 50-53 dB at their highest fan setting are considered among the quieter options.


Air purifiers are straightforward devices that operate on a simple principle. They primarily consist of fans and HEPA filters, making them both simple and cost-effective technology.

Don’t be misled by brands that claim their expensive premium air purifiers are the sole reliable options.

This is merely a marketing tactic to conceal the fundamental simplicity of their air purifiers.

This is wrong and led to many lawsuits in the past.

headline of the new york times announcing that molekule air purifier retracts ad claims
Air purifier brand Molekule was sued over wrong ad claims. Source: NYT

Studies showed that expensive air purifiers aren’t better air purifiers.

In contrast, you’d be surprised to find some budget-friendly units outperforming those with a price tag of THB 60,000 and upwards.

In any case, check the cost of replacement filters before making a purchase.

Some brands significantly mark up their HEPA filters.

Other than that, don’t focus too much on the price. Check the data and pay attention to CADR.

Good Air Purifiers for Large Areas in Thailand

If your room is bigger than 80 sqm (861 sqft) you should consider air purifiers designed for bigger rooms.

Look for units having a CADR of 600 (m3/hr) and up.

Smart Air – Blast Air Purifier

blast air purifier on white background

From Hospitals to Homes

Smart Air’s Blast air purifier is a straightforward yet highly capable air cleaner.

Frequently utilized in Asian hospitals, it features a large HEPA H13 filter that effectively deals with various germs and pollutants.

With a CADR rating of 950 m³/hr, it efficiently cleans rooms up to 150 sqm in approximately 25 minutes.

blast air purifier in the entrance hall of samitivey hospital
The Blast air purifier (background) in Thailand’s top-rated Samitivej Hospital

The Blast isn’t just for hospitals—it’s versatile. Gyms find it useful for giving athletes cleaner air during workouts.

It’s also effective in schools and offices. And don’t count it out for home use. If you’re in a spacious condo, the Blast integrates well there too.

the blast air purifier in a cozy living room
The Blast integrates well in living rooms too.

Quiet even on the highest setting

The Blast stands out with its unconventional design.

Unlike most air purifiers that release air through a small top outlet, the Blast utilizes its entire front panel.

This larger surface area contributes to maintaining remarkably low noise levels, even when running at high settings.

At maximum capacity, it registers only 43 dB, which is more than 25 dB quieter than Xiaomi or Blue Air models.

If you prioritize a quiet environment without compromising on air purification quality, the Blast is the ideal choice. Its distinctive low-noise feature sets it apart.

Currently, you won’t find a quieter yet effective option available in the Thai market.

air outlet pattern of the blast air purifiers front area
Hundreds of air holes in the Blast’s front area ensure quiet operation.

Simple Operation and Filter Change

The Blast keeps things uncomplicated, offering easy operation and hassle-free maintenance. When it’s time to replace the filter, just lift the top and make the switch.

Thanks to its substantial size, you can expect the filter to remain effective for at least 18 months in Thailand. If you’re interested in a Carbon filter, you can purchase it separately.

Blast air purifier opened with large HEPA filter
Replacing the Blasts HEPA filter is easy.

The Blast is equipped with lockable wheels for ease of mobility, which comes in handy considering its weight of over 30 kg.

Built with durability in mind, this machine is designed for the long haul.

With the Blast, you’ll find a straightforward three-speed dial, without any touchscreen or smart features.

However, don’t let that simplicity deceive you—when it comes to purifying the air, it surpasses brands like Blue Air, Sharp, and Dyson.

If you’d like to learn more about the Blast, you can watch Smart Air CEO Paddy introduce the unit in the video below.

Pro & Cons


  • Super strong CADR of 950 m³/hr
  • Super quiet on high operation
  • Simple, straightforward operation
  • Long-lasting H13 HEPA filter
  • Lockable wheels for easy mobility


  • Heavy
  • Rudimentary design (Some may like, some may not)
  • Carbon filter not included

Blast Spec Sheet

CADR950 m³/hr
Coverage Size150 m²
HEPA filterH13
Carbon filterOptionally available
Noise (dB)29 – 37 – 43 (low – mid – high)
Dimensions (LxWxH)33 – 57 – 123 cm
Power Consumption (W)48 – 81–118 (low – mid – high)
Weight 36 Kg
#1 for big rooms
Blast air purifier in a living room

The Blast is a no-nonsense champ for clearing air pollution in big spaces. Practical, powerful, and hushed—it’s the top choice for large areas. No contest!

Smart Air – Blast Mini Air Purifier

Blast Mini air purifier on white background

Powerhorse for rooms up to 100 sqm

The Blast Mini air purifier is a compact version of its bigger brother the Blast, suitable for spaces of up to 100 sqm.

Built on the same sturdy principles as its larger counterpart, the Blast Mini is a great choice for mid-sized condos, offices, and classrooms.

Its high-efficiency HEPA H13 filter efficiently captures a broad range of pollutants and germs, ensuring the air remains clean and healthy.

blast mini in a bedroom

Built on the same sturdy principles as its larger counterpart, the Blast Mini is a great choice for mid-sized spaces.

Boasting a CADR of 740 m³/hr, the Blast Mini swiftly purifies air in rooms as large as 100 sqm, making it an ideal choice for medium-sized condos, classrooms, and offices.

blast mini air purifier in an office
The Blast Mini in the UNCHR office in Thailand

True to the Smart Air ethos, the Blast Mini is straightforward to use and maintain. The filter replacement process is hassle-free; simply open the top and replace the filter.

a clean white hepa filter next to a dirty hepa filter
The Blast Mini HEPA filter lasts up to 18 months and traps all kinds of pollutants.

The filter’s durability is noteworthy, with a lifespan of at least 18 months when used regularly in Thailand. If you require extra purification, you can opt to purchase a Carbon filter separately.

The Blast Mini is also designed for convenient mobility, featuring lockable wheels. Its sturdy metal build ensures long-lasting performance and dependability.

a magnifyer highlighting an air purifier's lockable wheels
The Blast air purifiers feature lockable wheels for easy movement

Pro & Con


  • Impressive CADR of 750 m³/hr
  • Super quiet on high operation
  • Simple, straightforward operation
  • Long-lasting H13 HEPA filter
  • Lockable wheels for easy mobility


  • Heavy
  • Rudimentary design (Some may like, some may not)
  • Carbon filter not included

Blast Mini Spec Sheet

CADR740 m³/hr
Coverage Size100 m²
HEPA filterH13
Carbon filterOptionally available
Noise (dB)49 – 82 – 122 (low – mid – high)
Dimensions (LxWxH)33 x 57.5 x 63 cm
Power Consumption (W)48 – 81–118 (low – mid – high)
Weight 26 Kg
Great for Large Rooms
blast mini air purifier in the corner of a bedroom

The Blast Mini is a great air purifier for mid-sized rooms up to 100 sqm. It’s simple, straightforward, and amazing at filtering out all sorts of pollutants. A great choice to combat air pollution in Thailand.

Karl von Luckwald

Karl von Luckwald

Since moving to Thailand in 2019, Karl noticed the lack of scientific integrity in air purifier and water filter reviews. In response, he founded WE DO AIR to champion unbiased, science-based evaluations and empower consumers to make better-informed decisions.

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