I ran across an old Cadet model FX-102 in wall heater during a recent inspection. This is an older model of the Cadet brand heaters and is no longer produced due to safety issues. There was a now expired safety recall campaign by Cadet a few years ago where the majority of the units were replaced. 

If you have a Cadet brand in wall heater it is a good idea to check the model number against the recalled unit list that is still on the Cadet website. The recall is over for getting a new unit from Cadet but you still need to replace any of the affected models if they happen to be in your house.