I have the Jet version someone gave me used. It's working well. Other than that I can not help. I also have a homemade version made out of a furnace blower.
OTOH, it's a pretty simple device, basically a squirrel cage fan in a box with some controls. When my homemade version died, it was the motor. I was going to rebuild it around a different blower when I realized I could just swap out the motor, and I did. Might be easy enough to fix yours. If its the controls and yours croaked, you could wire around them and install a simple switch or put it on the circuit with the lights.