Abstract: The invention concerns a grille for burning all sorts of solid fuels in ses, hearths, central heating boilers, baking ovens, combustion furnaces, drying kilns and others.The grille exists of two grilles fitted one above the other and in contact with one another, one of said grilles is movable with respect to the other, the width of each passage opening in one of the grilles is greater in the middle of the grille, permitting to close gradually from their ends the passage openings of the other grille during the displacement of one of said grilles.