FIELD: agricultural engineering; plenum-exhaust ventilation. SUBSTANCE: deflector above exhaust shaft is made in form of wind vane resting on ball bearings installed on tubular heat exchanger for free turning of deflector over horizontal circumference of heat exchanger. In its upper part it has horizontal neck, and in bottom part, its vertical tubular end is freely fitted in larger diameter tubular heat exchanger. Rotary diaphragm is fitted in space of boat exchanger. EFFECT: improved ventilation of live stock barn. 4 dwg
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