Selection criteria for air purifiers

The 10 golden air purifier rules

If you are interested in an air purification device or want to purchase one, we want to be at your side here with advice and action. Because not all air purifiers are created equal! And if you have any questions, please contact us: office@aqa.at

1. Air Purifier - What it should and should be able to do
An air purification device should reliably and consistently clean the room air of impurities, loads (such as bacteria, viruses, pollen) and pollutants. This is best done with a HEPA filter. In combination with activated carbon, it should also be able to filter harmful gases (such as car exhaust fumes and cigarette smoke). An air cleaning device should not change the air, such as warming, humidifying, scenting or the like. Choose a device that specializes in filtering with the appropriate filters and filter performance. The entire exchange of air in the room where the device is located should be guaranteed several times per hour. In addition, it should be stable, quiet, energy-efficient and long-lasting. Also pay attention to what the replacement filters cost and how long the filter life is. Certifications, awards and the comparison of the so-called CADR value (Clean Air Delivery Rate) make it easier to decide which brand you should choose.

2. Filter performance or which device do I use for which room size

Choose a device that can filter a sufficient amount of air to fit your room size. But pay attention not only to the details of the room size in m², but also how often the entire air in the room can be filtered per hour. If you read a statement where it says "Suitable for rooms up to 20 m²", for example, it is unfortunately not very meaningful. The key factor here is the air exchange rate - i.e. how often can all the air be filtered per hour with this room size. If you cannot find the air exchange rate in the manufacturer's information or if it is low, we would advise against this device. Quality products allow air to be exchanged 5 times per hour!

Pay attention to the degree of separation achieved by the filters - i.e. how many% of the pollutants and which pollutants can be filtered. We only recommend high-quality filters such as HEPA filters that achieve efficiencies of up to 99.97%. In addition, filters can be equipped with special materials that also allow gases, odors or cigarette smoke to be filtered. Very good results are achieved here with filters that are additionally coated with activated carbon. If there is no manufacturer information on the degree of efficiency or if it is not significantly above 90% (e.g. 97%), we would recommend another manufacturer.

3. Type of filter
Pay attention to the degree of separation achieved by the filters - i.e. how many% of the pollutants and which pollutants can be filtered. We only recommend high-quality filters such as HEPA filters that achieve efficiencies of up to 99.7%. In addition, filters can be equipped with special materials that also allow gases, odors or cigarette smoke to be filtered. Very good results are achieved here with filters that are additionally coated with activated carbon. If there is no manufacturer information on the degree of efficiency or if it is not significantly above 90% (e.g. 97%), we would recommend another manufacturer.

4. Quality index: CADR
An essential quality criterion is the so-called CADR value. CADR stands for Clean Air Delivery Rate and provides information about the results with which the air cleaner filters the three types of particles, smoke, dust and pollen from the room air. First and foremost, it is used to compare different air purifier models with one another. The higher the value, the better the filter performance for the respective type of particle. If the CADR values are low or not given at all, it is best to look for something else.

5. Filter replacement - how long filters last and what they cost
Before buying an air filter device, pay attention to how often the filter needs to be changed and what the replacement filter will cost. Because often people are tempted with low device prices, but the filter costs are then considerably high. Also pay attention to whether there is an automatic indication of when the filter should be changed. If it is not changed often enough, it loses the necessary filter effect - on the contrary, it can blow the filtered substances into the room air again. If it is changed too often, this only causes unnecessary costs. If there is no information about the automatic filter change indicator in the description of the device, we would not recommend this.

6. Power consumption
Check the energy consumption of your air purification device. Under certain circumstances, this can be a cost factor. You can then easily compare the specified wattage with other devices or a lightbulb. Or you can calculate what it will cost you - example: the energy consumption of your air purifier is 30 watts. You pay 18 cents for the kWh. Your air purifier operates 8 hours a day, 7 days a week. In this case, you have electricity bills for the air purifier of 29 cents per week.

7. Noise development
A good air purification device is quiet and not annoying in normal operation. Check the description to see which dB (A) value is given. The usual noises in the apartment are around 40 db (A). A television set at around 70 dB (A). Compare this with the value of your air purifier at low or normal operating level (the highest level should only be in operation for a short time with optimal filter performance).

8. Electronic control
Optimal is a device that is equipped with sensors that permanently monitors the indoor air quality and automatically selects the required operating level accordingly or a device that can be electronically monitored and controlled remotely. This guarantees the best air quality without unnecessary switching up or down or switching on and off.

9. Common sense
Do not let yourself be influenced by mystical techniques or seemingly cheap products. An air purification device that helps you to effectively keep your indoor air free of pollutants or allergens is based on serious, scientific technology. And the device needs a certain volume / size in order to actually be able to filter the amount of air in a sufficient time. Pay attention to test marks and device labels. Check the product description to see whether all important information (air change rate, filter performance, filter costs, shelf life, filter change indicator, noise level, etc.) is included and which values are shown.

10. Side effects - read the package insert or ......
Your air purifier must effectively remove pollutants from the air in the room and must not create any additional pollution. Make sure that your device does not emit any harmful substances such as ozone into the room air during its functions (e.g. additional ionization of the room air).