Then determine what else is on that same circuit (from the service panel). Do the calc and see what amperage they draw together. if you have three devices (lightbulbs, say) 100watts each, that's 300w/110v=2.72A. Your voltage is 110~ and to calculate Amps, take your combined wattage / volts. If it only lists one, it'll be the highest draw (highest speed). You should be able to pull a wattage off the fan info sheet or labeling - it'll likely have three different wattages, one for each of the three speeds. If it also has a red, that's 14/3 - sometimes the red is used for a light kit or other - or it may just be capped off for future use. Most likely, it's 14/2, which means one white, one black, and one ground. The sheathing should be labeled, if you can pull enough slack out to read it.
#Two ceiling fans on one switch plus
If you pull the existing fan, and look at the wiring coming out of the ceiling, 14ga Romex usually has a white plastic sheathing, with either two or three colored wires, plus a bare copper ground. Most likely, the circuit that the current fan is on is 14ga Romex, which is good for 15amps total. Assuming the house is relatively new (10 years or so?): Without being able to see what you've got, it's kinda hard to say, but here's some info that may help you decide.
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