UV light and the coronavirus: Big Ass Fans might have a solution – CNET [CNET]

August 9, 2020 Thomas Giboney technology

haiku-uvc-in-living-room-640-550 — Big Ass Fans

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For years, doctors and health professionals have been using ultraviolet light as a disinfectant. Now, a major ceiling fan manufacturer is mounting UV lights onto the base of its smart ceiling fans, and promising they can rid a room of viruses and bacteria within minutes.

The company is Lexington, Kentucky-based Big Ass Fans, best known for its eponymous industrial ceiling fans, and the maker of the luxurious Haiku line of smart, app-enabled residential ceiling fans. Earlier this year, the company rolled out a new “uplight” accessory for those Haiku models that casts decorative light up onto the ceiling. Then, when the pandemic hit, the company thought back to 2011, when it teamed with an architecture firm to equip a hospital in Rwanda with ceiling fans to help improve the efficacy of wall-mounted UV sanitizers used to kill pathogens like tuberculosis.

A Haiku ceiling fan equipped with virus-killing UVC lights.

Big Ass Fans

It was your classic light bulb moment: What if that uplight was a UV sanitizer, with the ceiling fan pulling air up into its disinfection zone? With a head start on the legwork, the company scrambled to action.

“Mid-March, all of a sudden, it’s kind of, wait a minute, we’re already working on an uplight,” says Big Ass Fans spokesperson Alex Risen. “And yeah, we put about four months of additional research and engineering to make sure that we’re doing this the right way, but we were already 90% there.

“Sometimes in product development, it’s better to be lucky than good,” Risen admits.

Now, after an initial batch of independent lab-based tests, Haiku ceiling fans equipped with UV lights are available for order — the first smart home product designed specifically to combat the spread of COVID-19. With the UV lights adding $500 to the already ceiling-high price tag (standard, non-UV models start at about $1,250), they won’t come cheap.

Compelling claims

“Seamlessly integrated atop the fan, Haiku’s UVC fixture directs invisible light upward, killing up to 99.9% of viruses, bacteria, mold, and other harmful airborne agents that pass through the disinfection zone,” the company promises. “Haiku’s powerful air mixing improves circulation within the space, bringing more pathogens into the disinfection zone and halting the spread of disease.”

That’s quite the claim — but the science is sound. UV light from the sun is the environment’s primary germicide, something scientists were documenting as early as 1877. Hospitals have been harnessing that power for years, with special UV lamps and wands used to sterilize rooms and equipment. This year, airlines, cruise ships and other businesses have begun using a variety of UV systems to sanitize common spaces.

The invisible light isn’t practical for use in homes and around people, because direct exposure is dangerous for eyes and skin — but that’s where the ceiling fan approach seems to make sense. With the UV light source sitting above the fan blades and shining up towards the ceiling, there’s no risk of exposure for anyone sitting below. Big Ass Fans says that it always adheres to any applicable certification standards required for legal sale and consumption, and that the Haiku UVC is no different. The company adds that the lights are programmed not to shine when the fan is off, which allows for safe cleaning and maintenance.

“We would say if you want to run it 24/7, we have 100% confidence in running it 24/7,” Risen says. “The only impact is a positive impact in that it would continue to kill pathogens.”

Early testing looks promising. In April, the company hired a team of third-party researchers from Intertek to study the fan’s effectiveness. The researchers installed it in a 1,000-cubic-foot test chamber, then released a small amount of phi X 174, a bacteriophage commonly used as a stand-in for deadlier pathogens in tests like these. After 10 minutes with the Haiku spinning overhead, the researchers removed a petri dish from the room, let it sit overnight, and then compared it with a petri dish from an identical chamber with no fan at all.

“We actually got a 99.9% kill rate within 10 minutes,” Risen says. “And they know that [phi X 174] is a great surrogate for most things that are difficult to kill in the air. So if it does well against this, your confidence is that it’s going to do well against other stuff, too.”