I bought a ceiling fan, and ordered one rated for 110 volts. When it arrived, the fan motor housing was marked 220 volts. I told the seller they'd shipped me the wrong unit, and I'm being told (in bad English) that the fan will work fine at either 110 volts or 220 volts. I'm not sure how that's possible. In my understanding, the fan will draw twice as much current at 110 volts, which could result in overheating and damage. Am I missing something? Is it possible that this is actually safe?