The archive · Hardware & Devices · Product decision · 2025–2026
Sonic Fire Tech bets infrasound can replace sprinklers; $15M seed
Cleveland startup uses ~20 Hz infrasound to snuff fires in seconds, no water or cleanup; $3.5M seed Oct 2025, $15M total by Aug 2026.
Sonic Fire Tech
What the business is
Sonic Fire Tech builds acoustic fire-defense systems that pump inaudible ~20 Hz infrasound through ceiling ducts; when sensors detect a flame, a piston-driven generator fires sound at it to suppress the fire in seconds without water or chemicals — sold and installed for commercial kitchens, homes, utilities and industrial sites.
Starting capital：$3.5M seed (October 2025, Khosla Ventures and Third Sphere), plus additional funding led by The O.H.I.O. Fund with Khosla doubling down — closing the seed at $15M in August 2026.
How it started
Board chairman Michael Thomas had tinkered with sound-based firefighting and, stuck, cold-contacted Geoff Bruder — a NASA engineer focused on heat and acoustics — through LinkedIn. Bruder built a prototype from a subwoofer and parts from Home Depot and AutoZone, and knocked a fire out from seven feet in his driveway. The startup then abandoned loudspeaker designs and dropped to about 20 Hz infrasound from a reciprocating piston, below the hearing range, so suppression could be powerful yet safe; TechCrunch exclusively reported the $3.5M seed from Khosla Ventures and Third Sphere on October 14, 2025.
What happened
In August 2026 Sonic Fire Tech closed additional funding led by The O.H.I.O. Fund with Khosla reinvesting and Third Sphere and AirAngels continuing, bringing the seed to $15M. The money funds hiring in Cleveland, near NASA's Glenn Research Center, and the testing needed for National Fire Protection Association certification — a process that typically takes about three years. The company is testing kitchen and home systems, has found its infrasound contains rather than extinguishes lithium-ion battery fires, is working with PG&E and Southern California Edison on utility equipment, holds a letter of intent with a chemical storage facility, and is in talks with insurers about premium discounts; its wildfire exterior-home system is moving more slowly while it waits for time at a suitable testing lab.
No ending yet — it is still running.
Background
Sonic Fire Tech is a Cleveland-based hardware startup betting that inaudible, ~20 Hz infrasound can replace water and chemicals as fire suppression. When sensors detect a flame, a piston-driven generator pushes sound through ceiling ducts to bombard the fire, snuffing it in seconds with no water, chemicals, or cleanup — an answer to sprinkler systems whose suppression damage can shut commercial kitchens for months.
The technology grew out of a decade-old internet novelty: two college students once extinguished a fire with a booming subwoofer. Board chairman Michael Thomas tinkered with the idea and cold-contacted Geoff Bruder, a NASA engineer who had worked on heat and acoustics, on LinkedIn; Bruder built a first prototype from Home Depot and AutoZone parts and knocked a fire out from seven feet in his driveway. The startup then dropped below the audible range, using a piston to generate infrasound that is powerful but safe and transmits further.
TechCrunch exclusively reported the startup's $3.5M seed in October 2025, from Khosla Ventures and Third Sphere, and in August 2026 reported that The O.H.I.O. Fund led additional funding, with Khosla doubling down, closing the seed at $15M. The money funds hiring and testing needed for National Fire Protection Association certification, which typically takes about three years; third-party engineers have already found the system equivalent to NFPA 13D residential sprinkler standards, and the company is demonstrating it in a 3D-printed home in Altadena's Eaton fire zone.
The open question is certification and adoption: the startup's first market is residential and commercial kitchen protection, where roughly half of home fires start, and it is talking with insurers about premium discounts that could accelerate adoption. Its wildfire exterior-protection system is progressing more slowly while it waits for time at a suitable testing lab.
What has to be true
- Cleanup wedge: sprinklers stop fires but water and chemicals wreck buildings — about 75% of commercial kitchens never reopen — so a suppressant with zero collateral damage has a clean pitch.
- Frequency insight: audible sound strong enough to suppress fire would damage hearing; ~20 Hz infrasound made the power safe and travel further, turning a party trick into an installable system.
- Hardware-founder fit: NASA acoustics engineer Bruder, Ohio manufacturing base near NASA Glenn, and Khosla's early conviction let a hard-tech startup raise $15M before certification.
- Certification as moat: winning NFPA and UL approval and qualifying for insurer premium discounts would let Sonic Fire Tech sell as a sprinkler-class product rather than a novelty.
What can be applied
A failed idea often fails in the wrong form: sound firefighting flopped as a loud novelty, but below the hearing range it became plausible — and the real bet shifted to certification, not the demo.
Aftermath
As of September 2, 2026, Sonic Fire Tech has closed its seed at $15M (led by The O.H.I.O. Fund, with Khosla doubling down and Third Sphere and AirAngels continuing) and is spending on U.S.-based manufacturing, an install-partner network, and certification work in Cleveland near NASA Glenn. Field validation with the Fire Service and California residential pilots are under way, UL validation is in progress, and third-party engineers have established NFPA 13D equivalency. No broad commercial deployment or revenue is reported yet, and the company has not announced when approval may come.
Sources
- Exclusive: Inaudible sound might be the next frontier in wildfire defense
- Sound-powered fire protection startup gets $15M to snuff out fires before they turn catastrophic
- The O.H.I.O. Fund Announces Lead Investment in Sonic Fire Tech's Seed Round; Khosla Ventures Reinvests
spotted an error? The archive wants to know.
Your turn
You just read one. Describe what you are building, and see who is betting on the same thing.
Free account · 3 free questions · no card