FIELD: heat processing of materials. SUBSTANCE: cooler has lined well 1 and air distributing chamber 2 having air distributing openings 3 made in side walls 4 and opening 5 made in bottom 6 and valve 7. Air duct 8 made in cover 9 of chamber 2 connects the chamber with air blower 10. The top part of air duct 8 is lined. The valve is mounted with a spaced relation to bottom of chamber 2 under opening 5 for permitting control of area of the space in the range of 0.008-0.04 of area of the openings made in the side of the chamber. EFFECT: enhanced reliability. 2 cl, 1 dwg
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