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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.

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. 

No, a ceiling fan doesn’t have to be wired to a switch, but it’s often more convenient. You can use the included pull chain if your ceiling isn’t too high or install a remote module later, as they are a cheap, easy-to-install option that’ll let you control both the fan and light fixture.

The more surface area that a ceiling fan blade has, the more effective it will be at producing airflow. Therefore, a longer ceiling fan blade is the better option if you’re looking for more wind. However, a longer blade will consume more energy than a shorter blade.