Teach your baby the sign for the word fan (as in ceiling fan) in baby sign language with the following description and video.
Hold the signed number one (1) next to the forehead. Rotate the index finger in a circle to mimic the motion of a fan.
ASL Pro: http://www.aslpro.com/cgi-bin/aslpro/aslpro.cgi
Signing Savvy: http://www.signingsavvy.com/