The speed at which you can clean the air depends on a variety of factors, such as the power setting you choose, the filters you use, and the ACH (hourly rate of air changes) of your air purifier. The quality of the air inside your home is always changing, and the impact of your air purifier will depend on its size, especially if you want to clean a single room or the entire house. Generally speaking, running an air purifier for a few hours a day should be enough to thoroughly clean the air in your space. If you're just looking to purify a smaller room, then half an hour to an hour should do the trick.
You can also set up a program that will give you all the benefits of an air purifier without having to keep it running all the time, but you should still run it at least once a day for optimal results. Investing in an air quality monitor can help you check the air quality in your home. The worse it is, the longer you'll want your air purifier to run. In about one hour, most air purifier units can clean the air and remove up to 95% of dust particles and other airborne contaminants.
In this case, an air purifier with an extraction rate of four changes per hour will work for only one hour and will successfully purify the air in the room where it is placed. When buying an air purifier, you should first consider what type of indoor air pollutants you are trying to remove. If you place it in a larger room, you may need to run the air purifier much longer in order to clean and purify the air and make it safe for allergy sufferers. A carbon filter (not a charcoal purifier) can remove allergens from a room much faster than a chemical filter.
The health effects of air pollution are far-reaching, but the risk can be reduced by keeping your air cleaner turned on. An average unit in your space, if working properly, should draw in about six air changes every hour. In fact, filtering the air can help remove harmful particles from indoor spaces, particularly allergens, smoke, and mold. For the unit to be effective, place it in a location where it can absorb dirty air and release purified air into your living space (especially if you have a jet focus mode like Dyson TP02 and TP04 models).
Needless to say, the closer your air purifier is to the source of any odors, the faster it will be able to clean the air. This mainly depends on the configuration of your air purifier, as well as the current state of your indoor air quality and the size of your room. Every time you turn off your air cleaner, it will stop filtering the air and you'll have to start over with its cleaning cycle. HEPA-filtered air purifiers don't heat up or have hazardous parts that could be dangerous if left unattended. It's also ideal for those who have just purchased an air purifier and aren't sure when they need to change their filter.
A higher CADR specification means that you don't have to run your air purifier for as long in order to purify the air in your room (assuming that it's sized correctly).