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A cooling system for a processing furnace provides improved cooling efficiency in a more compact arrangement than known furnace cooling systems. In the system a blower is situated within the cooling gas plenum but has its intake exterior thereto. The plenum wall and the furnace outer wall define a r

A cooling system for a processing furnace provides improved cooling efficiency in a more compact arrangement than known furnace cooling systems. In the system a blower is situated within the cooling gas plenum but has its intake exterior thereto. The plenum wall and the furnace outer wall define a recirculation channel which is relatively large and free of obstructions. Heat exchanger coils are disposed within the recirculation channel adjacent the blower intake thereby providing a less restricted flow path for the cooling gas.

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A heat treatment furnace having gas cooling or quenching capability comprising an outer furnace wall including a door of substantial size with suitable sealing means to retain a gaseous atmosphere; means for removing a gas from within the furnace; means for introducing a gas at controlled pressure i

A heat treatment furnace having gas cooling or quenching capability comprising an outer furnace wall including a door of substantial size with suitable sealing means to retain a gaseous atmosphere; means for removing a gas from within the furnace; means for introducing a gas at controlled pressure into the furnace; a heat shielded enclosure surrounding a heat treatment zone within the outer furnace wall, said enclosure being designed to retain heat within the zone and impede its outward flow, therefrom said enclosure having a plurality of orifices over a large area and a separate coolant recirculation passage from the enclosure; a plenum extending from the wall of the enclosure between the area perforated by the orifices and the recirculation passage along a path between the outer furnace wall and the heat shielded enclosure to divide the space between the outer furnace wall and the heat shielded enclosure into gas flow paths having opposite directions on opposite sides of the plenum, said gas flow paths including an inner path within said plenum for directing gaseous coolant flow toward and through the orifices in the heat shielded enclosure and an outer path between said plenum and the outer furnace wall for directing gaseous coolant flow away from the recirculation passage; a heat exchanger located in the outer flow path within the outer furnace wall and outside and at one end of the heat shielded enclosure so as to intercept the gas flow and act upon the gaseous material; blower means within and at the end of the plenum remote from the door in the outer furnace wall so that said blower means is between and connecting the outer gas flow path and the plenum for inducing gaseous flow circulation from the heat exchanger, through the blower means to the inside of the plenum and through the orifices into the heat treatment zone, whence it will recirculate to the heat exchanger and the blower means.