A float glass manufacturing apparatus according to exemplary embodiments of the present invention includes a float bath which accommodates molten metal and allows a glass ribbon to flow on a liquid surface of the molten metal in a first direction; a ceiling unit which is disposed to be spaced upward apart from the float bath and elongated in the first direction; and a cooling module which is disposed in at least a part of an entire region of the ceiling unit in the first direction and supplies downward a cooling gas that cools the glass ribbon.
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