When it comes to choosing a ceiling fan, you must first consider whether it will be installed indoors or outside. Select rooms in your home that require more airflow, are significantly warmer throughout the year, and are the most frequently used. The total size of the fan you should choose, as well as the accessories you'll need, will be influenced by the size of the room. If you want to hang your fan in a room with high ceilings, for example, search for one that can hang from a downrod (a metal rod that lowers the fan to the ground), allowing it to circulate the air more effectively. A chart illustrating the proper downrod length in relation to ceiling height can be found to the right.