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....
there are about four different blades for these little motors, you just have two options, take the fan out and take it to the dealer to get the right one or take the fan out and replace it with a good one such as a fantastic fan.