Heater question concerning coils in vent

[jasnake65]

Just purchased the American wire kit and in the process of redoing all of my wiring. I followed the wiring to the heater box and it was connected to a coil that is snapped into the back of the metal vent coming from engine bay. Is that more of a heater coil that gets hot when turned on? How do you check it to make sure it works or just better off getting new? Where can I buy this at? Looked at LMC but I didn't see it but I might of missed it also