Incinerator

As incinerator, comprising a housing defining a combustion chamber, a stack connected to the combustion chamber for discharging waste gases of combustion, said stack including a lower stack section and an upper stack section spaced above the lower section, a ring structure disposed between the lower end of the upper stack section and the upper end of the lower stack section and having a central opening, said ring structure including a tapered flange bordering said central opening, said flange diverging in an upward direction, an upwardly diverging sleeve freely supported on the ring structure and disposed concentrically of said tapered flange, said sleeve having a plurality of perforations, and air inlet means associated with said ring structure for providing communication between the atmosphere and the upper stack section, waste gases of combustion passing upwardly from said lower stack section through said sleeve causing an aspirating effect to draw air from the atmosphere through said air inlet means and into said upper stack section and into said perforations to effect a final combustion zone for the waste gases of combustion, expansion of said sleeve due to heating causing the sleeve to move upwardly relative to said flange.