Air purifier windows open or closed.
Air purifier while windows open.
Most air purifiers can remove at least 99 97 of particles as small as 0 3.
With only 1 window open there is some external air entering the room but the purifier can at least work with marginal efficiency.
However how effective the air purifier is depends on both the purifier itself and the pollution level of the air.
Fresh air also has oxygen which you need to breathe so you need to strike a balance.
Obviously closing the windows is the most effective but if you have to balance outdoor pollution against vocs or co2 indoors it is possible to get some ventilation and significantly reduce pollution.
Fresh air has pollen smoke and other potential irritants.
Doors opened or closed it does not really matter.
Is going to be subjective.
The bottom line to the question.
It would just be a matter of how much would come in if the windows were closed.
I have allergies so i use an air purifier.
If you can open a window in a room while the air purifier is working it is not a bad idea to mix in a little fresh air as well.
Regardless most companies will use the terms air cleaner and air purifier interchangeably.
The air purifier is going to clean the area it is immediately contained to regardless.
With 2 or more windows open often the air purifier will have almost no effect.
Keep your windows open to prevent locking irritants into rooms when air purifiers aren t running.
Create a stronger cross draft by opening windows on opposite sides of the room if possible.
If you have used chemicals or have a source of bad quality of air like burning.
You should consider opening your window if you aren t using the air filter or if you re only doing it for a short period but only if the outdoor environment is in relatively good shape and you have a reason to.
While still at it the purifier the air in the room will not be as clean because contaminated air will still be getting into the room while at the same time some of the purified air will be escaping out.
While air cleaners often include filters they are overall more robust in cleaning the air than air filters.
It is a common misconception that operating an air purifier for an hour or two in a room will sufficiently clean the air.
Humans pets air conditioning and heating systems and open windows are all responsible for introducing contaminants into a room.
My partner likes to open windows to get fresh air.
Airflow with 1 vs 2 or more windows open can be dramatically different.