A new fan will work perfectlyh well with the old fashioned electromechanical relays. It will work perfectly well with no ground, just hot and neutral (positive and negative if you really insist although it will not work with real DC positive and negative and might not work with modern solid state relays).
The significance of being properlyh grounded is so that if someone should reach up and touch any metallic parts, it is much safer that way.
Separtely routed ground wires (grounding conductors) can be retrofitted to an existing electrical system and still be code compliant.
The significance of being properlyh grounded is so that if someone should reach up and touch any metallic parts, it is much safer that way.
Separtely routed ground wires (grounding conductors) can be retrofitted to an existing electrical system and still be code compliant.