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The square footage of your room will dictate the correct ceiling fan blade size. For example: 

• Rooms smaller than 75 square feet require a fan that is 29 to 36 inches.

• Rooms up to 175 square feet require 42- to 48-inch fans.

• Rooms up to 350 square feet require 52- to 56-inch fans.

• Expansive spaces over 350 square feet need a fan larger than 60 inches.

If the fan doesn’t have a switch, connect the white wire from the ceiling to the white wire from the fan; connect the green wire to the ground wire; connect both black wires; and connect both blue wires. If yours has a switch, the white and green wires are connected the same way. However, connect the ceiling’s red wire to the light’s black wire and the ceiling’s black wire to the fan’s black wire. 

In short, no. You can use the square footage range chart in this article to determine the right size ceiling fan for both indoor and outdoor spaces. However, weather elements can damage types of ceiling fans that aren't designed for outdoor use, so your ceiling fan should be weather-resistant if you plan to install it outside.

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.