An air purifier is a device that draws in air from a room, passes it through one or more filters, and then releases cleaner air back into the room. Simply put: it removes pollution from the air you breathe. But how does that process work exactly, and what do you notice in practice?
The basic operation of an air purifier
Every air purifier works according to the same principle. A fan draws air in, the air passes through one or more filters, and the filtered air flows back into the room. This process repeats continuously so that the air in the house is refreshed over and over again. The more often the entire air volume of a room is refreshed per hour (expressed in ACH, air changes per hour), the faster pollution is removed.
The filter stages
Most air purifiers work with multiple filter layers, each with its own task:
- Pre-filter: captures coarse dust, hair, and lint, and protects the finer filters behind it.
- HEPA filter: captures microscopically small particles such as fine dust, pollen, bacteria, and viruses.
- Activated carbon filter: absorbs odors and volatile organic compounds (VOCs), such as cooking smells or paint fumes.
In the Dynter AirPure Plus PA244, these steps are combined into a 4-stage filtration system with a HEPA13 filter, which, according to specifications, filters 99.97 percent of fine dust, pollen, bacteria, viruses, and microplastics from the air.
What do you notice in practice?
An air purifier does not visibly undo pollution in one fell swoop; it is a continuous process. Many people notice that the air feels fresher, that less dust settles on furniture, and that complaints such as a tickly nose or itchy eyes decrease somewhat during pollen season. These are experiences, not medical guarantees: an air purifier is not a medical device and does not cure conditions, but it can contribute to a more pleasant indoor climate.
Capacity and noise
Two practical figures largely determine how well an air purifier performs: the CADR (Clean Air Delivery Rate, how much clean air is delivered per hour) and the noise level in decibels. A higher CADR means a larger area can be effectively cleaned. The PA244, for example, has a CADR of 260 m3/h and is suitable for up to 55 m2, with a noise level between 28 and 60 dB, depending on the chosen setting. At the lowest setting, it is barely audible, which makes it suitable for use in the bedroom.
Why should you use an air purifier?
Indoor air can, contrary to popular belief, be dirtier than outdoor air. Cooking, pets, outdoor traffic coming in through windows and cracks, and accumulating dust all contribute to a buildup of particles. An air purifier continuously captures some of that pollution while you go about your life in the room.
Where is the best place to put an air purifier?
The location in the room makes a difference. Do not place the device directly against a wall or in a corner behind furniture, as this hinders air intake and output. A clear spot, for example about half a meter from the wall, in the room where you spend the most time, yields the best results. In the bedroom, it is especially nice if the device is quiet enough at its lowest setting to leave running next to the bed, as is the case with the PA244 with its night mode.
Maintenance: why replacing filters is important
An air purifier only continues to work well if the filters are replaced on time. A full pre-filter or saturated HEPA filter captures fewer particles and can obstruct airflow, causing the device to work harder and become louder. Most manufacturers provide a guideline for replacement intervals, often every 6 to 12 months with daily use, depending on the air quality in the home and how the device is used.
Our advice is to look at the surface area of the room where you want to place the device and match the CADR value accordingly. For an average living room or bedroom, the Dynter AirPure Plus PA244 with its HEPA13 filtration and three settings is a practical and quiet choice for daily use.