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, which has long been known and documented in scientific literature and the press, 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 I witnessed 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. “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,” said Geoff Bruder, co-founder and CEO of Sonic Fire Tech, during the presentation.
Acoustic Fire Suppression: The Science Behind the Sound
The concept of using sound waves to extinguish flames is not new. Research dating back to the 1960s demonstrated that low-frequency acoustic waves could disrupt combustion by creating alternating pressure regions that separate fuel vapors from oxygen. More recent studies have refined this principle, showing that infrasound, typically in the range of 20 to 100 Hz, is particularly effective because its long wavelengths can travel through complex spaces without significant attenuation. Unlike water or chemical agents, sound waves do not require direct line-of-sight and can penetrate around obstacles, making them theoretically attractive for suppressing fires in cluttered environments like kitchens or server rooms.
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 the science of acoustic fire suppression. Its executives have already been touring Southern California; the Concord event was the first in the northern half of the state. The company aims to make this infrasound technique mainstream in both commercial (for instance, a data center, where sprinklers would damage electronics) and in-home installations, given that sprinklers are already required in all new California homes built in 2011 and later. Sonic Fire Tech also hopes to produce a backpack-based system that could be worn by wildland firefighters headed out into the field.
How It Works: Infrasound vs. Traditional Sprinklers
Sonic Fire Tech says that its system is as good as, if not better than, traditional sprinklers for many applications. “Sonic Fire Tech is in fact intended to replace interior residential sprinklers,” Pollack told Ars. “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. “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,” says one release. “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.”
The goals sound great, but they do raise questions among outside observers. “Sprinklers have a well-established role,” Nate Wittasek, a Los Angeles-based fire protection engineer, commented. “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.
Testing and Validation: Skepticism from Experts
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, to establish Sonic Fire Tech’s bona fides. Sonic Fire Tech declined to provide a full copy of Lynch’s report, citing “confidential and patent-pending information,” but it did send the 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.” But the summary lacks any kind of 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.” “Equivalency [to the 13D standard] can only be approved by the appropriate authority having jurisdiction and requires technical documentation be submitted demonstrating the equivalency,” said Jonathan Hart, NFPA Technical Lead, Fire Protection Technical Resources. To date, Sonic Fire Tech has not publicly provided this information.
Wittasek said that if Sonic Fire Tech is going to claim that its product is as good as or better than the NFPA 13D standard, it should be able to provide a whole range of specifics, such as “who validated it, what test protocols were used, what fire scenarios were included, and how success was defined.” “I 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,” he added. “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 the University of California, Berkeley, and an expert in fire dynamics, said there’s 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,” he stated. “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.”
Wildland Applications and Firefighter Perspectives
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,” Dutter said. “The District would be open to testing this system on one of our dozers,” Dutter added, to “better understand its limitations and potential failure points.” With new tech like this, firefighters also want to understand what “long-term maintenance requirements” it has, 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 potential for infrasound in wildland firefighting is particularly intriguing. Wildfires can spread rapidly, and traditional suppression methods often involve heavy equipment, retardant drops, or hand crews. A backpack-mounted infrasound device could theoretically allow firefighters to attack small spot fires without the need for water or chemicals. However, the same experts who question its residential application are even more skeptical about its use in the wildland context. The 2018 academic paper referenced earlier notes that the acoustic method is most effective in enclosed spaces where sound waves can concentrate; in open, outdoor environments, the energy dissipates quickly. Wind and thermal updrafts could easily overcome the relatively weak pressure differentials created by infrasound, rendering the technique ineffective against even moderate flames.
Moreover, the logistical challenges of powering such a system in the field are significant. The demonstrated unit used wall-mounted emitters connected to a power source, but a portable backpack would require batteries capable of delivering high-energy pulses over an extended period. Current battery technology may not yet be able to support sustained use in a professional firefighting scenario. Sonic Fire Tech has not provided details on power requirements or expected battery life for its hypothetical backpack system.
Historical Context: The Long Road to Sprinkler Adoption
The development of fire sprinklers offers a useful comparison. The first practical automatic sprinkler was patented in 1872 by Philip W. Pratt, and the NFPA was established in 1896 to standardize installation rules. It took decades of rigorous testing, code revisions, and industry acceptance before sprinklers became mandatory in new residential construction in many jurisdictions. The 13D standard, specifically designed for one- and two-family dwellings, was first published in 1975 and has undergone numerous updates based on fire incident data and full-scale testing. Achieving equivalence to such a well-established standard is not merely a matter of demonstrating that a new technology can extinguish a single kitchen fire under controlled conditions; it requires proving consistent performance across the entire range of fire scenarios that can occur in a home.
Equivalent certification involves evaluating factors such as detection speed, response time, suppression effectiveness, and the ability to prevent re-ignition. The testing must also account for ceiling geometries, obstructions, and ventilation conditions. Sonic Fire Tech’s executive summary mentions “consistent performance across a variety of installation configurations,” but without detailed test protocols and results, the claim remains unverified. The NFPA’s Hart emphasized that equivalence approvals are made on a case-by-case basis by local authorities having jurisdiction (AHJs), which could include city fire marshals, building officials, or insurance ratings bureaus. Each AHJ will require technical documentation that meets the specific requirements of the adopted building and fire codes.
Potential Benefits and Remaining Hurdles
If infrasound suppression can be proven reliable, the benefits are clear. Water damage from sprinkler systems costs billions of dollars annually in the United States alone. In homes, burst pipes or accidental activation can ruin flooring, furniture, and personal belongings. In data centers, a single sprinkler discharge can destroy server racks and disrupt critical services. Acoustic systems would eliminate such collateral damage entirely. They also offer the advantage of being able to suppress grease and chemical fires where water might be ineffective or dangerous (e.g., kitchen fires involving cooking oils that can cause steam explosions if sprayed with water). The instantaneous deployment—milliseconds compared to the minutes it can take for sprinklers to activate—could catch fires at a very incipient stage, preventing them from growing into room-flashover events.
Yet the hurdles are substantial. Beyond the need for extensive testing, the cost of manufacturing and installing infrasound emitters and control systems must compete with the relatively low cost of sprinkler hardware and plumbing. While sprinklers require a network of pipes, water supply, and sometimes pumps, an acoustic system would need electrical wiring, speakers, and possibly backup power. Retrofitting existing buildings could be challenging. Maintenance is another unknown: sprinklers are largely passive and require minimal upkeep, whereas electronic components and speakers may need periodic calibration or replacement. The question of reliability in the event of a power outage or sensor failure must also be addressed. The company has not disclosed the expected lifespan of its emitters or sensors, nor the cost of replacement.
Despite these uncertainties, the demonstration in Concord represents a step forward in the long journey of making acoustic fire suppression a commercial reality. The interest from fire departments suggests that the industry is open to innovation, but the caution from fire protection engineers underscores the importance of empirical validation. As Sonic Fire Tech continues to develop its system, the coming months will be critical. The company plans to conduct further tests, including those on bulldozers and in wildland settings, and seeks partnerships with fire agencies for additional research. Whether infrasound will eventually hang beside sprinklers or replace them entirely remains an open question—one that will be answered not by a single demonstration, but by years of rigorous scientific and engineering evaluation."
Source: Ars Technica News