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 been known for decades. It works by vibrating oxygen molecules away from the 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, CAL FIRE, and invited journalists. Geoff Bruder, co-founder and CEO of Sonic Fire Tech, explained that his company figured out how to distribute the infrasound through ducting like a sprinkler system, rather than using a point-and-shoot method.
The company’s goal is to replace traditional sprinklers, which are effective at stopping fires but can also cause significant water damage to a property. Sonic Fire Tech appears to be the first firm trying to commercialize acoustic fire suppression. Executives have already toured Southern California; Wednesday’s event was the first in the northern half of the state.
The company aims to make this infrasound technique mainstream in both commercial settings—such as data centers where sprinklers would damage electronics—and in homes. In California, sprinklers are already required in all new homes built since 2011. Sonic Fire Tech also hopes to produce a backpack-based system for wildland firefighters.
Stefan Pollack, a company spokesperson, emailed after the event that the firm is making meaningful technological improvements on a monthly basis. But two experts who spoke with the publication raised serious questions about the technology’s potential 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 that the system is intended to replace interior residential sprinklers. The demo showed a critical benefit 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.
Press releases from the company tout infrasound’s advantages over sprinklers. They claim that 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. By contrast, Sonic Home Defense 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 goals sound great, but outside observers raise questions. Nate Wittasek, a Los Angeles-based fire protection engineer, noted that 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), a well-known industry nonprofit, was founded in the late 1800s to develop a uniform standard for sprinklers. The latest iteration of those guidelines, known as the 13D standard, is well documented and widely adopted. A recent press release from Sonic Fire Tech 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 reporters that 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 confidential and patent-pending information, but did send a two-page executive summary. This document 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, explained that equivalency to the 13D standard can only be approved by the appropriate authority having jurisdiction and requires technical documentation demonstrating the equivalency. To date, Sonic Fire Tech has not publicly provided this information. Wittasek said that if the company is going to claim equivalency, it should provide specifics such as who validated it, what test protocols were used, what fire scenarios were included, and how success was defined.
He would want to see full-scale testing that includes typical residential fires like furniture and mattress fires, cooking fires, electrical fires, and attic or exterior ember exposures. It should also cover different conditions like open and closed doors, varying ceiling heights, crosswinds, obstructed fuel packages, and whether the fire comes back after the system shuts off. Similarly, Michael Gollner, a professor of mechanical engineering at UC Berkeley and an expert in fire dynamics, told reporters there is simply not enough information yet to show that 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. Gollner believes 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 he supports 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 reporters that the agency does not recommend specific products, but it does try to understand the uses that new technology can have. Sonic representatives indicated they are exploring opportunities to partner with fire departments to test this technology on a bulldozer. The District would be open to testing this system on one of their dozers to better understand its limitations and potential failure points.
With new tech like this, firefighters also want to understand long-term maintenance requirements, whether routine testing or calibration is required to ensure reliability, and how system failures such as a malfunctioning detector or acoustic generator are identified and communicated to an owner. The company continues to refine its system, but the path to widespread adoption remains unclear. Until independent, published, and rigorous testing confirms the results, the fire safety community will likely view infrasound suppression as an intriguing experimental tool rather than a proven replacement for century-old sprinkler technology.
In addition to home and data center applications, the company is exploring wildland firefighting uses. They envision a backpack unit that could be worn by firefighters heading into remote areas. However, the immense energy required to generate low-frequency sound waves over large distances, combined with the rapidly moving nature of wildfires, presents even greater challenges. Experts remain extremely skeptical that any acoustic system could stop a wind-driven crown fire. Even for smaller brush fires, the sound waves would need to be directed precisely and maintained for extended periods.
The history of fire suppression technology is filled with promising inventions that never supplanted water. From chemical foams to inert gas systems, each has found niche applications but none has replaced the simplicity and reliability of sprinklers. Sonic Fire Tech will need to overcome not only technical hurdles but also regulatory and confidence barriers. The NFPA standards process is deliberately conservative, requiring years of data before new methods are accepted. The company has not yet publicly filed for any such listing.
Meanwhile, the demonstration kitchen fire was small and controlled. It did not involve hidden flames inside walls or under furniture. It did not test the system's ability to prevent re-ignition after the sound stopped. Critics note that even if the sound initially extinguishes a flame, hot surfaces can still cause re-flash. With cooking oils, the auto-ignition temperature can be reached again if the pan remains on a hot burner. A sprinkler would continue to cool the pan and surrounding surfaces until the heat source is removed. An infrasound system, once turned off, provides no such cooling.
The company has not publicly shared data on power consumption, component reliability, or cost. They claim the system can be integrated into existing ductwork, but many homes lack such ducting in kitchens. Retrofitting could be expensive. Additionally, the sound emitters must be strategically placed to cover all potential fire origins without being blocked by cabinets or appliances. These engineering challenges are not insurmountable, but they add to the uncertainty.
As the fire protection community watches this development, the consensus remains that any new technology must be held to the highest standards of proof. Lives and property depend on it. Sonic Fire Tech's demonstrations generate media attention and curiosity, but until the company opens its test results to independent peer review and secures formal listings from organizations like UL or FM Global, its claims will be met with healthy skepticism. The journey from a lab demonstration to a certified life-safety device is long and arduous. Whether infrasound waves will one day join the arsenal of firefighting tools or remain a fascinating footnote remains to be seen.
Source: Ars Technica News