In a tempering furnace (1) for heating workpieces (8), with a furnace chamber (3) having a charging opening (5) for receiving the workpieces (8), a heating fan (20) conveying a hot air into the furnace chamber (3), a shutter (9) which is selectively movable into an open position opening the charging opening (5) or a closing position closing the charging opening (5), a support (7) on which the workpieces (8) rest in the furnace chamber (3), and a horizontally movable manipulator (11) arranged in front of the furnace chamber (3), the invention proposesAn assembly called a drawer (6) is arranged in the furnace chamber (3) having the support (7), the shutter (9) being fastened to and movable together with the drawer (6),and the drawer (6) can be moved out of the oven chamber (3) or back into the oven chamber (3) by means of the manipulator (11),€ ¢ that both above and below the support (7) hot air inlets (26) open into the furnace chamber (3),wherein the hot air inlets (26) are configured and arranged such that the hot air emerging therefrom is directed onto the carrier (7),€ ¢ and that the heating fan (20) the hot air with a high flow velocity of at least 7 m / s and at a high circulation rate of at least 30,000 m 3 / h is designed to promote.
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