if the fan has a built in timer you can either wire it through the room light switch but this wll only work if the light is on or put it through a seperate pull cord using the + side of the room swich to power up the new
run two individual cables from the new pull cord to the fan
when swiched off the timer will run on the fan a short time after swiching off
in allcases check the wattage as the feed is only 1.5 mm cable
jobby, October 2008