US Patent 10240796 Fire pit insert assembly

Embodiments of a fire pit insert include a mixing tube with a fuel outlet end, a soundwave input end located below and horizontally offset from the fuel outlet end, and a fuel inlet located between the fuel outlet end and the soundwave input end. A fuel distribution chamber connected to the fuel outlet end has a top plate with orifices, a bottom plate spaced apart from the top plate, and a baffle located between the top and bottom plates. The baffle is arranged coaxial to the fuel outlet end.