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Generally, a ceiling fan should be mounted at least seven feet from the floor in the center of your room with a wall clearance of around 18 inches. If your ceiling is more than eight feet high, it’s recommended by experts that the ceiling fan be mounted around eight to nine feet from the ground. This helps ensure a better quality of circulated airflow.

Fan power is measured by CFM, or cubic feet per minute. For every 1,000 feet of square footage in your attic, you need a minimum of 700 CFM. Steeper roofs may need larger fans or about 840 CFM.  You can figure the size of attic fan you need by multiplying the square footage of your attic floor by 0.7. (multiply by 1.2 for a steep roof and 1.15 for a dark roof). That number is the CFM required for your fan to run efficiently.

The number of blades for your fan poses both advantages and disadvantages. Typically, the more blades on a fan, the better the air distribution and cooling effect, but this also means that your fan will have more wear on its motor. For small rooms, three-blade fans should work fine. For larger areas like living rooms, four or five-blade fans might be the better option. 

Yes, you can install a ceiling fan where a standard light fixture is, as the electrical wiring is often similar and may not need to be replaced. The most important step is to ensure the ceiling can support the fan's weight and motion. You will need to replace the existing light fixture's electrical box with a fan-rated electrical box, which is specifically designed to handle the extra weight and vibration. These boxes will be labeled as suitable for ceiling fan support and will indicate the maximum weight they can hold. Before you begin, also consider if you need an extension rod for a high ceiling or a special mount for an angled ceiling.