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Not to dumb it down, but I can see this being an effective tool for preventing grease flare-ups in my grill. It won't cool the coals, but it will kill the flames.
How does it work? I mean is it a new discovery that some frequencies create resonance and stop the convection and prevent oxygenation of the flame? Or is it just using sheer power to "blow" the flame off? but instead of a blower, it just uses very high powered speaker in low frequency?
It pushes/removes the air, so the fire goes out. As I read, this was something that's been researched but it's not useful for anything but blowing out candles, since in a real fire whatever's burning will just reignite since the burning material is not cooled or anything. Simply, the flame is suppressed momentarily.
Or you could equipate an electric ashtray with this.