Apparatus for controlled incineration air supply

Claim 1

Apparatus for directing a curtain of air over material burning in a generally rectangular burning pit, said apparatus including an elongated tubular plenum member, air supply mean comprising a powered fan adapted to deliver air to said plenum member, and a nozzle structure extending from one side of said plenum member along substantially the entire length thereof, said nozzle structure providing a series of passages each terminating in an elongaged narrow discharge slot and the discharge slot for each passage arranged end-to-end with the adjoining slots, and means for reinforcing said aligned discharge slots comprising a protecting beam attached to said nozzle structure adjacent said slots and extending the total length of the slots, said plenum member being adapted for positioning adjacent one margin of the burning pit with said nozzle structure extending toward the pit and the discharge slots directed at the opposite pit wall and below the upper margin thereof, said nozzle structure comprises upper and lower plates secured in parallel spaced relation to said plenum member at one of their margins and converging toward each other adjacent their opposite margin to define said elongated discharge slot, and generally triangular gusset members spanning the space between said plates and spaced along their length to rigidify said nozzle structure and to conduct heat away from the converging end area of said plates.