COVID-19 FREQUENTLY ASKED QUESTIONS

In these uncertain times, the Alen team is committed to your wellbeing. That includes providing clear information about how air purifiers can and cannot protect you from coronavirus (COVID-19). In addition to the information below, you can find even more detailed data in our recent COVID-19 blog.

*IMPORTANT: if you believe that you or someone in your household might have COVID-19, take immediate action by following the Centers for Disease Control and Prevention (CDC) guidelines. Alen does not offer medical advice. Consult your doctor or a medical professional with healthcare questions.



How can a HEPA air purifier help with virus prevention?
  • YES. True HEPA filtration can effectively capture virus particles, according to 3rd party lab testing. But NO air purifier can completely protect you from a virus.
  • For schools and businesses, HEPA air purifiers are recommended by the CDC and EPA alongside other safety measures as “part of a plan to protect people indoors.”
  • With a heightened focus on prevention, we think air purifiers also support your body’s most important tool for fighting viruses—a healthy immune system.
Can HEPA air purifiers capture COVID-19?
  • Yes. Independent tests show Alen BreatheSmart purifiers can quickly and effectively remove airborne virus particles.
  • In bioaerosol testing by LMS Labs using a live FDA-approved COVID-19 proxy (MS-2 bacteriophage), the Alen BreatheSmart 75i removed over 99% of virus particles from a 1,050 ft3 test chamber within 20 minutes 
Can HEPA air purifiers kill COVID-19?

No, not directly… But virus particles trapped by a True HEPA filter will lose their infectiousness (or die) within three days once isolated outside a host, according to Harvard Health.

How long can COVID-19 remain infectious?
  • COVID-19 can remain infectious for three hours when airborne and up to three days on surfaces, according to the latest published research.
  • Primarily spread by droplets released when an infected person coughs or sneezes, the droplets (aka aerosols) can stay suspended for a half-hour, researchers said, before drifting down and settling on surfaces.
  • Once captured and isolated, viruses cannot multiply on their own and will die without a host.
How small are virus particles? Can HEPA filters capture that size?
  • Extremely small—over 20X smaller than dust, soot, or smoke particles. COVID-19 particles average 0.125 microns (between .06 to .14 microns), according to the New England Journal of Medicine.
  • Yes. Alen’s medical-grade True HEPA (grade-H13) filters can capture 99.99% of airborne particles, including aerosolized viruses, down to 0.1 microns.
  • In bioaerosol testing by LMS Labs using a live FDA-approved COVID-19 proxy (MS-2 bacteriophage), Alen BreatheSmart purifiers quickly and effectively removed high concentrations of virus particles from a 1,050 SqFt space.
  • Independent testing also demonstrated a removal rate of over 99% throughout the entire COVID-19 range down to 0.06 microns.
  • According to a NASA study, “HEPA-rated media provides superior performance for removing virtually 100% of particulates,” including “…fine (<2.5 micron) and ultrafine (<0.01 micron) sized particulate matter.”
  • For more information about how HEPA filters work, read our COVID-19 blog.
      Which of the filters that Alen offers are best for virus protection?
      • All of Alen’s filters for the BreatheSmart family and the T500 feature True HEPA grade H13 media which performs according to the references here. The addition of carbon or MP odor powder in any of these filters would address smell concerns—not be active against a virus.
      • The major consideration for better effectiveness is having a properly sized purifier for the room(s) involved to assure sufficient volume of air flow to capture airborne particles
        Is Ultraviolet (UV) light effective for killing viruses in air purification and why don’t you offer it?
        • The gold standard for germ-free purification exists in well designed and maintained hospital operating rooms. In those spaces, multiple HEPA filters and directional airflow are used. UV light is used as an optional additive measure. However, to be effective, UV light rays must have a direct line of sight to the virus particle and for enough time. Learn more here about how UV light has been used to address viruses in hospitals.   
        • Given their relatively small size, air purifiers must pull a lot of airflow through an efficient filter in order to clean an entire space. Thus, the amount of time between air entering and exiting the unit is very short. To further complicate matters, it is well documented that the Coronavirus is particularly robust by its length of survival time on various surfaces. Will UV kill viruses? Yes, but to a far lesser degree of effectiveness than efficient HEPA filtration and whole-room airflow. We could offer this but have yet to find the balance between effectiveness and cost.
          What is the safest way to remove and replace an Alen filter?
          • For maximum personal protection while replacing an entire Alen filter at the end of its service life, use gloves (and a mask if you wish) to pull the filter from the unit, put it into a trash bag, and tie the top. Particles caught in the filter are held securely by HEPA fibers unless the filter is vigorously shaken or dropped. For occasional cleaning of the prefilter, it is best to use gloves to pull it off and discard it—again in a trash bag while replacing with new one. In very dusty or high pet dander/fur conditions you can also wear gloves and vacuum the prefilter in place carefully with a brush attachment. 
          • You can find more information about prefilter cleaning and purchase replacement prefilters here.

              We sell air purifiers and have for 15 years, but we will be the first to recommend additional means of wellness, prevention, and immune system support in addition to breathing pure air. We encourage you to follow ALL guidelines recommended by the CDC and World Health Organization.