Smart Air Blast Review

We test every air purifier the same way so you can compare results from one review to the next. For the Blast we used our usual 9 square meter room with a 2.5 meter ceiling. That is far smaller than the offices and gyms the Blast is built for. We keep the same room anyway so every AirLab result can be compared, and scale the numbers up for bigger spaces later in this review. We light incense sticks to fill the air with fine particles. When our Temtop S1 monitor shows PM2.5 at 75 micrograms per cubic meter, we take the incense out, turn the unit on, and stop the timer when that reading first falls to 15 or below. We fill the room with smoke again before each speed. The photos below show this Blast run. If you want every rule in one place, including where we put the monitor and how we measure noise and power, read the full method on our methodology page.

1. 01

   Step 1: We close up the test room

   Every run happens in the same closed 9 m² room with a 2.5 m ceiling. The door stays shut and the air conditioning stays off, so the smoke comes from our incense and not from open windows or the street.

   

2. 02

   Step 2: We light incense sticks

   Next we light incense sticks so the room fills with fine particles and smoke. When the Temtop S1 reads 75 µg/m³, we take the incense out of the room.

   

3. 03

   Step 3: We place the Blast and the air monitor

   We place the Blast against the side wall, leave a gap behind it for the dial, and lock the wheels. The Temtop S1 sits on a desk across the room and keeps logging PM2.5. We do not start the cleaning timer until that reading reaches at least 75 micrograms per cubic meter.

   

4. 04

   Step 4: We run every speed and time the cleanup

   When the start level is reached, we turn the dial to the speed we are testing and start a timer. We stop the timer as soon as the monitor first shows PM2.5 at 15 micrograms per cubic meter or lower. We do a separate run on speeds 3, 2, and 1, each one starting again from at least 75, so every speed gets its own cleanup time.

   

5. 05

   Step 5: We check how much electricity it uses

   After the particle runs, we plug the Blast into a wall energy meter. We write down the watt reading on every speed so we can estimate the yearly electricity cost later in this review.

   

6. 06

   Step 6: We check how loud each speed is

   Last we measure sound with a handheld meter held 1 meter from the unit. We do this for every fan speed. That same distance is used on every AirLab review so the noise numbers stay comparable.

   

Full protocol (gates, placement, noise, power, scoring): the AirLab methodology.

We ran the Blast through our standard incense particle test in the closed 9 m² lab room (2.5 m ceiling). We lit incense sticks until the Temtop S1 read 75 µg/m³, took the incense out of the room, and switched the purifier on. We stopped the clock at the first moment PM2.5 fell to 15 µg/m³ or below, then filled the room with smoke again before testing the next speed. That is the same start and clean gate we use on every AirLab review, so you can compare one unit to the next.

Full protocol on the methodology page.

The Blast is about as tall as a filing cabinet and as wide as a narrow bookshelf. It is designed for big rooms where moving a lot of air matters more than looks.

The case is white painted metal, with a tall front panel punched with rows of small Y-shaped holes and a small Smart Air badge near the top. It feels very solid; nothing flexes or rattles on speed 3. In an office, gym, or classroom it reads as equipment and fits in. In most homes it will dominate the room.

Air is drawn in through the big perforated front and through one very large H13 HEPA filter behind it. That filter area is the secret to the Blast: the fan does not have to force air through a small sheet, so it can move a lot of air without a high-pitched whine. It is also why the filter lasts so long.

Four caster wheels with ON / OFF brake tabs carry the 36 kg. Lock them to keep it in place, unlock them to move it.

The only control is a three-speed dial on the back. No screen, sensor, auto mode, timer, or app. In a school or office that is exactly right: set it once and nobody changes it. At home, remember to leave space behind it so you can reach the dial.

This filter is for particles: dust, smoke bits, pollen, and pet dander.

The Blast uses one very large H13 HEPA filter. WEDO AIR says it captures up to 99.95% of particles on the first pass. H13 is the grade often called True HEPA, the same grade as the SA600 and a step finer than the Sqair.

WEDO AIR says the filter traps PM2.5, viruses, bacteria, pet hair, and mold, and describes the Blast as hospital approved. We do not treat virus and bacteria claims as medical results. A good particle filter can catch tiny bits in the air. That is not the same as treating an infection.

Filter life is where the listing is least consistent. The page says 18 to 24 months in one place, 19 to 22 months in the details table, and 17 to 20 months in the bullet list. All of them agree it is long, which is one of the Blast's biggest advantages. In a smoky season or a busy gym, plan on the lower end.

The official replacement is one large H13 HEPA filter at ฿3,950 on WEDO AIR. Filters are not covered by the 1-year unit warranty. If you skip changes, clean-air output drops and the fan works harder for less result.

Schedule

Every 18 to 24 months, depending on how dirty the air is.

Filter price

฿3,950 per HEPA filter (carbon filter ฿2,950)

Annual cost

About ฿2,765 / year at 10 hours a day (about 0.7 filter)

How you change it

Turn the dial off and unplug. Lock the wheels. Take off the tall perforated front panel, slide the big HEPA filter straight out, and slide the new one in with the airflow arrow pointing the same way as the old one. Refit the panel. No tools needed, but the filter is tall and awkward, so a second pair of hands helps. Have a large trash bag ready.

One filter per change. Confirm the live price before you buy. Blast HEPA Filter at WEDO AIR.

Speeds 1 / 2 / 3: 41.7 / 48.9 / 54.3 dB(A), measured at 1 m from the Blast (AirLab standard for every unit). That is about 11 to 13 dB above the listed 29 / 37 / 43 dB on every speed. Speed 1 is about as loud as a library, fine as background in an office or classroom. Speed 2 is like a quiet office. Speed 3 is a clear, steady rush of air you will notice in a meeting. None of the speeds is quiet enough for a bedroom.

Running the Smart Air Blast will cost about ฿4,219 per year for electricity plus filter replacements, about ฿352 per month. That is what you keep paying after you own the unit. The purifier itself is a one-time buy.

1. Electricity = ฿1,454 per year

Our wall meter read 53.6 W on speed 1, 88.4 W on speed 2, and 126.8 W on speed 3, about 5 to 9 W above the 48 / 81 / 118 W listing. For the yearly electricity line we assume 10 hours a day on speed 2, at ฿4.5 per unit of electricity (kWh), which fits an office or school day. For a machine this size, electricity is about a third of the yearly running cost.

1. Speed 1
   53.6W
2. Speed 2
   88.4W
3. Speed 3
   126.8W

88.4 W × 10 h/day × 365 ÷ 1000 = 323 kWh × ฿4.5/kWh = ฿1,454

2. Filter costs = ฿2,765 per year

The official Blast H13 HEPA filter is ฿3,950 on WEDO AIR, rated about 18 to 24 months. We treat that as about 5,100 hours. At 10 hours a day you use about 3,650 hours a year, or about 0.7 of a filter, so we budget ฿2,765 a year. If you add the optional carbon filter, budget roughly another ฿2,950 every 6 months.

฿3,950 × 0.7 packs · 5100 h rated life per cartridge

3. Product price = ฿19,990 once

WEDO AIR listed the Blast at ฿19,990 when we checked. Add that once in year one. After that you are paying for a filter every couple of years and a steady electricity line.

Totals

Annual running cost

฿4,219 / year · ฿352 / month

First-year total

฿24,209 (unit + running)

Est. per month (year 1)

฿2,017 / month

The Blast is a good fit when you have a shared room up to about 90 m² and want strong, set-and-forget cleaning with a filter that lasts for years. It is a mismatch for bedrooms, for anyone who expects it to reset the 150 m² on the listing quickly, and for anyone who needs to carry a purifier up stairs.

Brand figures come from the WEDO AIR listing. Measured figures are from our own tests. A dash means we did not measure it.

Here is what the WEDO AIR / Smart Air listing says next to what we measured in our room. Brands test in sealed lab chambers and we test in a furnished room, so small gaps are normal. We only say a claim falls short when the gap would change which purifier you should buy. The full rules are on our methodology page.

• What the brand says

  Clean air output (CADR) 950 m³/h

  Matches our test

  What we found

  In our 9 m² room, a 950 m³/h purifier should clear the smoke (75 → 15 µg/m³) in about 11 minutes on speed 3. It took 12.4 minutes, in line with the listing.

  What it means for you

  For about 4 air changes an hour, we'd use it in rooms up to about 90 m².

• What the brand says

  H13 HEPA filter, 99.95% on the first pass

  Matches our test

  What we found

  It is a very large pleated H13 cartridge, and PM2.5 fell quickly on every speed, even speed 1.

• What the brand says

  Rooms up to 150 m² (140 m² in the details table)

  Different standard

  What we found

  At 150 m² the Blast gives about two and a half air changes an hour. That is below even the Chinese GB/T 18801 sizing rule, which tops out at about three and a half. We size rooms for about four air changes an hour, for faster cleanup.

  What it means for you

  For fast cleanup, one Blast covers about 90 m². In a 150 m² office it still keeps the air steadily cleaner; plan on two units if you want smoky air cleared quickly.

• What the brand says

  Cleans rooms up to 150 m² in 25 minutes

  Different standard

  What we found

  25 minutes is about how long it takes to push one room's worth of air (150 m² × 2.5 m) through the filter once. That is not the same as clearing smoky air, which takes several passes. Scaling our 12.4-minute result, bringing 150 m² from 75 down to 15 µg/m³ would take over three hours.

  What it means for you

  Read the 25 minutes as one full air pass, not a full cleanup.

• What the brand says

  Quiet, 43 dB on speed 3

  Falls short of claim

  What we found

  Our meter at 1 m measured 54.3 dB(A) on speed 3, and 41.7 / 48.9 dB(A) on speeds 1 / 2. That is about 11 to 13 dB above the listing on every speed, roughly twice as loud to the ear. Our empty room reads about 20 dB(A), so room noise does not explain the gap.

  What it means for you

  Fine as background noise in an office or classroom. Too loud on speed 3 for a bedroom or a quiet meeting.

• What the brand says

  About 48 / 81 / 118 W power draw

  Close

  What we found

  The wall meter read 53.6 / 88.4 / 126.8 W on speeds 1 / 2 / 3, about 5 to 9 W (7 to 12%) above the listing on every speed.

• What the brand says

  Lockable wheels

  Matches our test

  What we found

  It has four caster wheels with ON / OFF brake tabs.

The 7.5 overall score is the average of these category scores. Each one is scored for what the Blast is meant to do (clean a shared office or classroom), not as if it were a bedroom unit.

• Air purification

  9 / 10

  12.4 minutes on speed 3 in our 9 m² room, right in line with its 950 m³/h listing, and still 22.3 minutes on speed 1. Fastest unit we have timed so far, with far more headroom for big spaces.

• Maintenance and cleaning

  9 / 10

  One filter that lasts around two years, no tools. It is tall and awkward to swap, but you rarely have to.

• Features and functions

  3 / 10

  Three speeds on a back dial, and wheels. No sensor, no auto mode, no timer, no carbon in the box.

• Design and looks

  6 / 10

  Sturdy and purposeful, but it still reads as industrial equipment. Fine in a gym or warehouse-style office; hard to love in a finished meeting room.

• Material quality

  9 / 10

  Painted metal cabinet with no flex or rattle, and solid locking casters.

• Convenience and ease of use

  7 / 10

  Set it in place, lock the wheels, turn the dial. At 123 cm and 36 kg with the dial on the back, day-to-day use is clumsier than a home unit.

• Value for the price

  9 / 10

  About ฿19,990 for 950 m³/h that held up in our test and a filter that lasts around two years. Hard to beat on clean air per baht for a shared space.

• Overall satisfaction

  8 / 10

  For an office, meeting room, or classroom up to about 90 m², it cleans as advertised for years. The large noise-claim gap on every speed and the industrial size keep it from scoring higher.

For an office, meeting room, or classroom up to about 90 m², the Blast is a sturdy, set-and-forget purifier that cleans as fast as its listing promises, with a huge H13 filter that lasts around two years and lockable wheels. Treat the 150 m² claim as a background-cleaning size, and expect it to be louder than listed. For bigger spaces plan on more than one unit; for bedrooms, pick the SA600 or Sqair.

Supporting resources:How we test·All reviews·Editorial policy