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If you want to know if your air purifier works when windows are opened, we highly recommend you read the test below. The test shows that keeping the doors and windows closed will keep airborne particulate levels at 50% less than outdoor air on average. Because on average, indoor air had only 51% of the .5 micron particulates of outside air.
But some people really want to keep their windows open. For others, it’s a way to reduce chemicals coming from new furniture or recent remodeling. Without these best air purifiers for allergies, running an air purifier with your window opening is risky.
Can we have both air purifier running and windows opening? Or are our purifiers useless with when our windows are open? We give you a great test from a China team - Smartairfilter about Do air purifiers work when windows are opened.
Do air purifiers work when windows are opened - The test
The effect of having your window close will be more prominent when outdoor air is hazardous.
To keep the baseline level of pollution consistent across tests, they opened the window to make sure outdoor air let in and reach the level of outdoor air quality.
When the particle count reached the same level as outdoors, they ran an air purifier. He ran three tests with the windows open and three tests with the window closed.
Related post: Are air purifiers safe to use?
Do air purifiers work when windows are opened - The result
With the window closed, the air purifier reduced particulate by an average of 90% after 20 minutes. With the window open, the air purifier managed just a 60% reduction in particle count.
The data shows that it’s clearly better to close the windows. No shocker there! But here’s the more interesting part: even with the windows open, it’s still possible to significantly reduce indoor particulate by turning on a purifier.
Related post: Why You Need a Humidifier For Allergies
Closing your windows and turning on your purifier will give you the lowest PM2.5 levels in your home.
However, if you have to balance the PM2.5 threat against high levels of VOCs or CO2 indoors, it is possible to get some ventilation AND significantly reduce PM2.5 levels indoors with your window open and purifier on.
Open windows are usually a good thing unless you live in an industrial or dirty area where you can't get the benefits from opening your windows to let in some good old fashioned fresh air from outside. There will be some pollutants, such as pollen, that will enter the room, but for the most part, they'll find their way inside the room whether the windows are opened or closed. It would just be a matter of how much would come in if the windows were closed. 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.
Doors opened or closed, it does not really matter. The air purifier is going to clean the area it is immediately contained to, regardless. If you do not want further contaminants from an outside source entering the room while cleaning it with an air purifier, close both windows and doors for maximum effectiveness. But, if they do happen to be left open, the air purifier will clean the new pollutants that enter the room from a window or door, as well.
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