Delta shaped air cooler has a set of shutters across its base to control air flow. These can be adjusted under freezing conditions to preventing frost damage to the tubes by partially or completely shutting of the air flow. The system has =4 flaps mounted on shafts which are parallel to each other. When down these shut off the air inlet side of the triangle formed by the cooler elements. When up, the angle of inclination of the middle flaps is less than that of the outer flaps. To prevent freezing of open sided air coolers of triangular section. Allows low temps. to be achieved in the water being cooled without the risk of freezing.
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