The length of the blades on a 52-inch ceiling fan refers to the diameter of the circular path they trace when the fan is in motion. In this case, the blades on a 52-inch ceiling fan extend from the center hub to the outer edge, creating a 52-inch (132 cm) span.
It's important to note that the length of the blades alone does not determine the overall size of the fan. Ceiling fans also have a motor housing, downrod (if applicable), and other components that add to the overall dimensions. The 52-inch measurement specifically refers to the diameter of the circular area covered by the spinning blades.