Researchers in Texas said they have designed a virus-trapping air filter that can kill the coronavirus instantly using extremely high temperatures, and can be installed in existing cooling and heating systems.
The announcement comes as public health leaders are acknowledging that SARS-CoV-2, the virus that causes COVID-19, could be airborne indoors, meaning it can remain floating in the air long after an infected person leaves a room.
The team says the filters could be used in airports, airplanes, office buildings, schools, cruise ships and other locations where airborne spread is of "high priority" such as hospitals and other health care settings.
A study on the "catch and kill" air filter was published Tuesday in the journal Materials Today Physics.
"This novel biodefense indoor air protection technology offers the first-in-line prevention against environmentally mediated transmission of airborne SARS-CoV-2 and will be on the forefront of technologies available to combat the current pandemic and any future airborne biothreats in indoor environments," Dr. Faisal Cheema, study co-first author and an associate professor of biomedical sciences at the University of Houston College of Medicine, said in a news release.
The team used nickel foam as the foundation of the air filter because it's porous, flexible and electrically conductive, meaning air can flow through it while being heated at the same time, according to the news release.
A caveat to the material is that the foam itself cannot be heated to high enough temperatures needed to kill the virus, so the researchers folded the nickel by connecting it with electrical wires to combat the issue.
At a temperature of about 390 degrees Fahrenheit, the air filter killed 99.8% of the coronavirus particles that made a single pass through the system in a lab setting, the release said.
Another study found that 133 degrees Fahrenheit was hot enough to kill coronavirus particles, according to a paper published in April in the journal The Lancet Microbe.
"By making the filter electrically heated, rather than heating it from an external source, the researchers said they minimized the amount of heat that escaped from the filter, allowing air conditioning to function with minimal strain," according to the release.