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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.

There are many types of ceiling fans available, each designed for different spaces and needs. Standard ceiling fans are the most common type and work well in most rooms. Low-profile ceiling fans are better suited for rooms with low ceilings. Smart ceiling fans can be controlled with a smartphone or voice commands. For larger spaces with ceilings between 10 and 25 feet high, large ceiling fans are ideal. Dual-motor fans have two motors to produce more airflow in multiple directions. You can also find energy-efficient or Energy-Star models that can be up to 60% more efficient, as well as fans with built-in lights or retractable blades.

The direction you want your ceiling fan to move in depends on the season you’re in. During summer, you want it to move counterclockwise to produce a cooling downdraft. During winter, you want it to move clockwise to circulate warm air throughout the room.

It is unlikely that a ceiling fan will fall, even if it develops a wobble. During a proper installation, ceiling fans are securely bolted to a ceiling joist, and the fasteners used for mounting are generally separate from the components related to balancing. A wobble is typically caused by an imbalance, which can be annoying and may lead to other issues, but is not usually dangerous on its own.

However, if a fan is wobbling because it was not installed correctly, it could be at risk of falling. For safety, it's always a good idea to ensure all mounting screws are tight and to address any wobbling or imbalance issues promptly.