The present invention relates to a grate bar and an integral stepped fire grate with directed air combustion. It finds its application in the field of furnaces for waste recovery units. The bar comprises a tray, the upper surface of which receives the incinerated elements, and which extends into two rear and front ends, each forming a return serving as a point of contact. support for the bar. It also includes a longitudinal projection under the tray, extending at least partially between the rear and front ends. At least one wing is disposed under the plate, a first side of the longitudinal projection. Typically, this wing has at least one lateral recess defining, with the lateral recess of a wing of a neighboring bar, an air duct passage to the front end of the bar. Thus, the combustion air is advantageously channeled towards this end.The bar may comprise one or more angular cutting elements, or knives, distributed under the plate, on either side of the longitudinal projection.The grid comprises at least one bar or a group of three bars. In the second case, the central bar in the group is movable relative to the two side bars in the group.
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