Can One Air Purifier Clean an Entire House? – Smart Air

Several people have asked me if they can use one purifier to clean their entire apartment or house. For example, can I put a large purifier in the living room and avoid having to put purifiers in each room?

The benefits would be great. This setup would be easier, cheaper, and less noisy, if the purifier is in the other room.

But it needs to work. Can a single purifier clean an entire apartment–even if the bedroom door is closed? The Smart Air team put it to the test using an entire Beijing apartment.

Test: One Purifier to Clean an Entire Apartment

I tested this in a large 134m2 (1,442ft2) Beijing apartment by putting the Blast purifier on a timer to turn on high every day from 7pm to 7am. A Laser Egg air quality monitor in each room kept track of PM2.5 continuously (how accurate is the Laser Egg?).

The Blast is a strong purifier. It puts out 890 cubic meters of clean air per hour—that’s equivalent to running three and a half BlueAir 203’s on high.

Running an air purifier in hallways to clean air entire home apartment

One bedroom door was always open; one was always closed. I switched which room was open and which was closed for half the tests. Windows were always closed.

Results: One Air Purifier Cleaning an Entire Apartment

Over 9 tests, the Blast reduced PM2.5 in both the room with the door open and the room with the door closed. However, the room with the door open (the Open Room) had 18% larger reductions.

air purifier in hallways easier to purify air quality in room with door open than door closed

That makes sense, since the purified air coming out of the air purifier could more easily enter the open room.

However, keeping the bedroom door open kept open also had its downsides. At the start of the test, the room with the door open had higher PM2.5 levels than the closed room.

air quality worse in room with door kept open than in the room with door kept closed

In this case, the open door was letting in more dirty air from outside.

Although the room with the door open got more of the clean air from the air purifier, this room was dirtier at the start of the test. At the end of the test, both rooms had similar levels of PM2.5.

clean air from apartment air purifier meant rooms with door open and door closed had same air quality

The Dirty Air Bounceback

In the two hours after the test ended, PM2.5 bounced back faster in the open room.

air in room with door open much more polluted when air purifier turned off

Open rooms have more air flow, which allows in more outdoor PM2.5. This quick bounceback is consistent with our earlier tests, which found that outdoor air pollution enters our homes constantly and quickly. That’s why I don’t recommend running the purifier for a bit, then turning it off.

12 Meters and Two Turns Away

We tested two setups. In one setup, the Blast air purifier was in the central hallway. In the other setup, the Blast was farther away in the living room:

Air Purifier in Living Room Enough to Clean Entire House And All Bedrooms

When the Blast was in the living room, it was a long way from the two bedrooms (around 10-12m/30-35ft away). Despite the enormous distance (and two turns around the hallway!), the Blast was still able to clean both bedrooms fairly well.

Bottom Line:

  • The Blast was able to reduce PM2.5 pollution, even when the Blast was outside of the bedrooms, even through a closed door.
  • Reductions were 18% larger in the open room.
  • Tests with the purifier find larger reductions with the purifier in the room itself.

Smart Air

Open Data

As always, I’m making the data openly available for all. You can download the day-by-day statistics here (Part 1, Part 2). For the full (totally overwhelming) minute-by-minute data, email us at [email protected].

What About Larger Apartments?

These tests were in a single-floor apartment. We haven’t tested houses with multiple floors. However, if the air purifier is strong enough, it’s reasonable to guess that an air purifier downstairs would be able to help clean the air in upstairs rooms.

How I Protect Myself

Smart Air is a certified B Corp committed to combating the myths big companies use to artificially inflate the price of clean air. We build empirically backed, no-nonsense purifiers and masks that use the same HEPA filters and even capture the same nanoparticles for a fraction of the cost of big companies.

Smart Air purifier more powerful cost less than other big brand air purifiers like blue air iqair

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