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If you’re replacing an old fixture with a ceiling fan, you usually won’t need a permit, but if your electrician runs new wiring for the fixture, you likely will need a permit. Building permits are necessary in most municipalities if you’re making changes to your electrical system, so even if you have partial wiring run to the area and need new wiring installed for added functionality, you’ll probably need a permit. Your electrician should be able to let you know if you need one, and they’ll typically file the paperwork for you.

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. 

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.

Many ceiling fan-rated electrical boxes tend to be made of metal. However, some electrical boxes may also be made of heavy-duty plastic that is reinforced with metal support structures. It may also have an attachment that connects directly to a ceiling joist. If you are ever ensure, consult with a licensed professional to get their insight on best practices and whether the installation is a safe one.