I would not install this fan, not because it is a poor product rather because of the type of motor. These types of motors typically use 3.5 amps or so, or 420 watts. According to my energy monitor my fan ran 70 hours in August (it is thermostatically controlled). You will probably use yours more than the 2 hours and 20 minutes a day that I did.
For illustration purposes lets use my usage. Using just that August, as an example, the GF-14 will cost 3.44 in electricity to operate for than month. Not a life changing amount but this fan:
QuietCool QC ES-1500 Energy Saver Fan Line Model: Amazon.com: Industrial & Scientific would cost .50. You will be paying this difference for every hot month year after year.