Adding smoke detectors in the bedrooms of a 50 year old house. One bedroom has a ceiling paddle fan in the center of the ceiling. A reversable fan. My concern is that the fan will blow away any smoke from the detector. Where should I place the smoke detector? 5 feet away on the ceiling, or maybe 10 feet? Or on the wall? Or is this a non-issue, being that smoke will find the detector anyway with or without the fan running?