Just bought a 1999 Terry 725R, when the previous owner was demonstrating its features he said "It has a bathroom fan" as he clicked the button, the fan blade shattered. "I mean, it HAD a bathroom fan....
On our new TT, I replaced the lame stock bathroom fan with a Maxxair. I was unable to go the cheap route, though--vertically challenged DW could not reach the vent, so I had to get one with a remote. The install took a couple of hours, it works great and it's quiet. Much better than the beanie copter the factory installs, which moves almost no air.