http://rimgo.zzls.i2p/gallery/Gy7Rwu6
You end up causing currents in the room, and room temp drafts *will* blow into the shower. It makes me cold, because my shower is higher than room temp, so the drafts coming in are comparatively cold. The larger the room is, the longer it ' ll take to get all the air in the room up to an equal warmer temp.