Rotating hood for ventilation pipes, smoke chimneys, and air extraction. Made of galvanized metal, very light, and resistant to weathering. It is installed easily and quickly to the extraction pipe. Hat designed to rotate with the action of the wind, so that the more the wind blows, the more the blades turn, and the more powerful is the air aspirate from the inside out. Prevents the wind from entering with forceinside the pipe, chimney, stove, etc., thus avoiding the undesirable effect of the house full of smoke.