Does an air purifier work against viruses?

Does an air purifier work against viruses and bacteria? Yes, a good air purifier demonstrably works against viruses and bacteria in indoor air. A HEPA 13 filter captures up to 99.97% of all particles 0.3 microns or larger—and since airborne viruses usually attach to larger droplets (aerosols of 1 to 5 microns) and dust particles, they are filtered out in the same step. Bacteria are even larger (0.5 to 5 microns) and are almost completely stopped. An air purifier therefore does not remove the virus at the source, but it does quickly and measurably lower the concentration of pathogens in the air you breathe. How does a HEPA filter capture viruses from the air? A common misconception is that viruses are "too small" for a HEPA filter. SARS-CoV-2, for example, measures approximately 0.1 microns, and the mesh of a HEPA filter is wider than that. The cleverness lies in the physics: viruses rarely float around freely in the air. They attach to mucus droplets, saliva particles, fine dust, and skin flakes. These carriers are many times larger and are stopped by a HEPA 13 filter through three mechanisms: interception (particles collide with the fibers), impaction (heavy particles cannot follow the airflow), and diffusion (small particles move erratically and still hit a fiber). The result: even for particles of 0.1 microns, a HEPA 13 filter remains over 99% efficient. This is why HEPA systems are used in hospitals, operating rooms, and laboratories—and also in our Dynter AirPure Plus PA244 air purifier. Which viruses and bacteria are captured? In practice, this concerns all pathogens that travel through the air via aerosols. Think of the flu virus, cold viruses (rhinovirus, RSV), corona variants, measles, and bacteria such as legionella and tuberculosis. An air purifier is not a replacement for hand washing or ventilation, but actually works in tandem with them: ventilation removes air to the outside, while an air purifier cleans the air that remains inside. What does the activated carbon filter do? In addition to the HEPA filter, a complete air purifier usually contains a layer of activated carbon. This layer does not capture viruses, but it does capture odors, VOCs, and gases—think of smoke residues, cleaning fumes, and body odors that often circulate along with germs. During a flu outbreak at home, you will quickly notice the difference: the air feels fresher, and you notice less quickly that someone has been suffering from a cold in the same room. Direct answer: Yes—an air purifier with a HEPA 13 filter captures up to 99.97% of particles from 0.3 microns, including the aerosols and dust particles to which viruses and bacteria attach. Combine it with ventilation for the best result. Product highlight: Dynter AirPure Plus PA244 The Dynter AirPure Plus PA244 is specifically designed for living rooms and bedrooms up to approximately 60 m². The air purifier combines a pre-filter, a HEPA 13 filter, and an activated carbon layer in one filter cartridge. Key features: Suitable for rooms up to 60 m² HEPA 13 filtration (99.97% at 0.3 microns) Silent sleep mode from 22 dB Automatic mode with air quality sensor (PM2.5) Timer and child lock Replaceable filter—available separately as a HEPA 13 replacement filter What exactly does a HEPA 13 filter filter? Particle type Size Captured by HEPA 13? Virus carriers (aerosols) 1 – 5 microns Yes, >99.9% Bacteria 0.5 – 5 microns Yes, >99.9% Mold spores 2 – 10 microns Yes, >99.9% Fine dust (PM2.5) ≤2.5 microns Yes, >99.9% Pollen 10 – 100 microns Yes, almost 100% House dust mite allergen 10 – 40 microns Yes, almost 100% Gases and odors (VOC) molecular By activated carbon, not HEPA How do you use an air purifier most effectively against germs? A few practical points make the difference. Place the device in the room where most people gather—living room during the day, bedroom at night. Keep it on 24/7 at a low setting; it will only switch to a higher setting automatically when the PM2.5 sensor triggers (for example, after cooking or if someone is coughing). Place the device openly in the room, not right against a wall or piece of furniture, so that the air can circulate freely. And replace the HEPA filter on time: a saturated filter is less effective. Do you want to know which model fits your room? View the full Dynter air purifier collection and choose based on square meters and desired features. Frequently asked questions Does an air purifier also work against the flu virus? Yes. The flu virus spreads primarily through aerosols and droplets of 1 to 5 microns. A HEPA 13 filter captures these particles with more than 99.9% efficiency. An air purifier thus lowers the virus concentration in the air you breathe. Is an ionizer better against viruses than a HEPA filter? No. An ionizer charges particles electrically but does not remove them from the air—they stick to walls and floors. A HEPA 13 filter physically removes them from circulation. For viruses, HEPA filtration is the scientifically proven choice. Should I continue to ventilate if I have an air purifier? Yes, keep ventilating. An air purifier cleans indoor air, but ventilation also removes CO2 and moisture. The combination is always best: open the windows for a while each day and let the air purifier run continuously. How quickly does an air purifier clean a room? That depends on the CADR value and the room size. A properly sized device refreshes all the air in an average bedroom 4 to 5 times per hour. In practice, you will notice the difference within 20 to 30 minutes. How often should I replace the HEPA filter? With daily use, every 6 to 12 months. Smoking, pets, or living in a busy city shorten its lifespan. The AirPure Plus filter can be ordered separately, so you can always change it on time. Does an air purifier help if someone in the house is sick? Yes, especially then. Place the device in the room where the sick person is staying, or in the shared room. The concentration of aerosols drops visibly within half an hour, which lowers the chance of infection for others. It is not a 100% guarantee, but it demonstrably reduces the risk.