In a makeshift demonstration kitchen in Concord, California, cooking oil splatters in and around a frying pan, which catches fire on an unattended gas stove. Within moments, a smoke detector wails. But in this demonstration, something less common happens: an AI-driven sensor activates and wall emitters blast infrasound waves toward the source of the fire in an attempt to put it out.
The science of acoustic fire suppression has long been known and documented in scientific literature and the press. It works by vibrating oxygen molecules away from a fuel source, depriving the fire of a critical component needed for combustion. Indeed, after just a few seconds of infrasound, the tiny kitchen blaze goes out.
The demonstration took place in the presence of numerous firefighters and officials from Contra Costa County Fire Protection District, the state's premier wildland firefighting agency (CAL FIRE), and invited journalists. Geoff Bruder, co-founder and CEO of Sonic Fire Tech, explained during the presentation: "We were able to not just point-and-shoot like a fire extinguisher; we figured out how to run it through ducting and distribute it like a sprinkler system."
The company's goal is to replace sprinklers, which are effective at stopping fires but can also do significant water damage to a property. Sonic Fire Tech appears to be the first company trying to commercialize acoustic fire suppression. Its executives have already toured Southern California; the Concord event was the first in the northern half of the state. The company aims to make infrasound technique mainstream in both commercial (e.g., data centers, where sprinklers would damage electronics) and in-home installations, given that sprinklers are already required in all new California homes built since 2011. Sonic Fire Tech also hopes to produce a backpack-based system for wildland firefighters.
Stefan Pollack, a company spokesperson, emailed Ars after the event: "We are making meaningful technological improvements on a monthly basis." However, two experts who spoke with Ars raised serious questions about the potential for this technology to supplant traditional sprinklers in a home. They are even more skeptical about its effectiveness in uncontrolled wildfire situations, where flames can grow very quickly.
Sprinkler replacement?
Sonic Fire Tech says its system is as good as, if not better than, traditional sprinklers for many applications. Pollack stated: "Sonic Fire Tech is in fact intended to replace interior residential sprinklers. The demo showed a critical benefit of SFT over water sprinklers in suppressing a kitchen fire, which represents about half of all residential fires. This is also applicable to commercial kitchen fires and other common grease and chemical fire applications."
The company's press releases tout infrasound's advantages over sprinklers. A release notes: "Traditional residential sprinklers activate several minutes only after heat rises to a threshold, can discharge large volumes of water that damage interiors and electronics, and require plumbing infrastructure that adds cost and complexity. Sonic Home Defense, by contrast, deploys in milliseconds and uses inaudible low-frequency infrasound waves to disrupt the chemistry of combustion before flames can spread, with no water, no chemicals, and no risk of flooding the interior of the home being protected."
But these claims raise questions among outside observers. Nate Wittasek, a Los Angeles-based fire protection engineer, emailed Ars: "Sprinklers have a well-established role. They apply water directly to the fuel, cool the space, slow or stop flashover, and give people time to get out while reducing risk to firefighters. Sound may knock down a small flame, but it does not cool hot surfaces or wet fuel. That raises real questions about re-ignition, smoldering fires, hidden fires, and fires that are partially blocked by contents."
Water sprinklers have been around for a long time. The National Fire Protection Association (NFPA) was founded in the late 1800s to develop uniform standards for sprinklers. The latest iteration, the "13D" standard for residential sprinklers, is well-documented and widely adopted. A recent Sonic Fire Tech press release states that the company has "secured third-party validation of its system as a viable NFPA 13D-equivalent alternative to conventional residential sprinklers." The company told Ars it has been evaluated by James Andy Lynch and his team at Fire Solutions Group, a Pennsylvania-based consultancy. Sonic Fire Tech declined to provide a full copy of Lynch's report, citing confidentiality and patent-pending information, but it did send the two-page executive summary. The summary states that "the Sonic Fire Tech system is capable of delivering extremely rapid fire detection, meaningful suppression or extinguishment, and consistent performance across a variety of installation configurations." However, the summary lacks detailed explanation of which tests were run and under what conditions. It also concludes that "additional testing and optimization are recommended to further expand the range of validated applications," adding that Sonic Fire Tech's products have the "potential to complement or, in certain applications, serve as an alternative to traditional suppression systems."
Jonathan Hart, NFPA Technical Lead for Fire Protection Technical Resources, emailed Ars: "Equivalency [to the 13D standard] can only be approved by the appropriate authority having jurisdiction and requires technical documentation be submitted demonstrating the equivalency." To date, Sonic Fire Tech has not publicly provided this information. Wittasek added that if the company claims equivalency, it should provide specifics such as who validated it, test protocols, fire scenarios, and success definitions. He also wants to see full-scale testing with typical residential fires like furniture, mattress, cooking, electrical, and attic or exterior ember exposures, as well as different conditions like open/closed doors, varying ceiling heights, crosswinds, obstructed fuel packages, and whether the fire returns after system shutdown.
Michael Gollner, a professor of mechanical engineering at UC Berkeley and expert in fire dynamics, told Ars there is not enough information yet to show this technology works better than sprinklers. He pointed to a 2018 academic paper which found that "acoustics alone are insufficient to control flames beyond the incipient stage." By contrast, "Fire sprinklers are extensively tested and certified by standards developed by the fire safety community over many years. I think this product needs to demonstrate the same or better performance with the same reliability before it can be considered to replace any existing safety measure. While I am absolutely supportive of out-of-the-box thinking, lives are truly at stake, and new technologies must carefully demonstrate effectiveness and reliability before being entrusted by society."
Dozer time
As for the Contra Costa County firefighters who hosted the demonstration, they are curious to see more. Deputy Fire Chief Tracie Dutter told Ars that the agency does not recommend specific products but does try to understand the uses new technology can have. "Sonic representatives indicated they are exploring opportunities to partner with fire departments to test this technology on a bulldozer," Dutter said. "The District would be open to testing this system on one of our dozers to better understand its limitations and potential failure points." With new tech, firefighters also want to understand long-term maintenance requirements, routine testing or calibration needs, and how system failures such as a malfunctioning detector or acoustic generator are identified and communicated to the owner.
The potential for infrasound fire suppression extends beyond residential use. Data centers, where water damage from sprinklers can destroy servers and disrupt operations, represent a promising market. Similarly, commercial kitchens, industrial facilities, and even aircraft cabins could benefit from a waterless suppression system. However, the technology must prove its reliability in diverse and challenging environments. The physics behind acoustic suppression is sound: low-frequency sound waves create pressure variations that disrupt the flame's structure and remove oxygen from the combustion zone. But real-world fires are complex, often shielded from direct acoustic waves by obstacles or located in concealed spaces. Sprinklers, by contrast, can reach hidden fires through ceiling-level water distribution and provide cooling that prevents re-ignition.
Another key issue is detection speed. Sonic Fire Tech claims its system detects fires in milliseconds using AI-driven sensors. While this is faster than traditional heat-activated sprinklers, which can take several minutes, the detection aspect must be paired with immediate suppression. In the demo, the fire was small and unobstructed. Whether the same results occur with larger fires or in cluttered environments remains unknown. The company has not released detailed performance data, making independent verification impossible. Fire protection engineers emphasize that any new suppression technology must undergo rigorous testing per standards like UL 217, UL 1626, and NFPA 13D to ensure equivalent life safety.
Historically, alternative suppression methods such as inert gas or chemical agents have been used in specialized settings, but water remains the benchmark for residential and commercial fire protection. Infrasound could find a niche where water damage is unacceptable, but it may not fully replace sprinklers. The Contra Costa Fire District's interest in testing the system on bulldozers hints at wildland firefighting applications. If infrasound can be deployed from vehicles or backpacks, it might help protect equipment or create firebreaks. But in a wildfire, high winds, large flame fronts, and intense heat present immense challenges. The 2018 paper Gollner referenced specifically warned that acoustic suppression is only effective on small, contained flames.
The future of infrasound fire suppression depends on transparent data and independent certification. Sonic Fire Tech has a long road ahead to convince fire marshals, insurance companies, and building code officials. The company must demonstrate that its system can handle dark scenarios: fires behind furniture, smoldering mattresses, grease fires in deep fryers, and electrical fires in walls. It must also prove long-term reliability, as sprinklers have a failure rate of less than 1% over decades. Acoustic emitters, detectors, and AI systems introduce electronic components that could degrade or malfunction. The company also needs to address power requirements; infrasound generation consumes energy, whereas sprinklers require no electricity to activate once the thermal element fuses.
Despite the skepticism, the idea of using sound to fight fires is compelling. It evokes science fiction but is grounded in real physics. Researchers have experimented with low-frequency and even sonic waves for decades, but no one has successfully commercialized the technology. If Sonic Fire Tech can achieve UL listing and NFPA equivalency, it could revolutionize fire safety in certain applications. The stakes are high: every year, home fires kill thousands and cause billions in damage. Any new tool that saves lives and reduces property loss is welcome. But as experts warn, caution is essential. Lives depend on proven performance. The company must be willing to submit to the same rigorous scrutiny that has made sprinklers the gold standard for over a century.
Source: Ars Technica News