FIELD: transport.
SUBSTANCE: invention is intended for protection of vent grates against icing. Grates are heated by making hollow stiffness ribs at grates and laying heating cable inside said stiffness ribs. Optimum spacing between said rubs and louver thickness are selected to ensure optimum heating of louvre by transfer of heat therefrom over metal.
EFFECT: ruled out icing at low arctic temperatures at standard operating conditions of electric heater.
2 cl, 4 dwg
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