Erica Havers, who joined Blodget Oven Co. as an accounts payable clerk 27 years ago, has been promoted to president of the Blodgett Oven Group, which includes the Blodgett, Perfect Fry, Marsal and BKI brands. She has been serving as general manager. The group’s offices and factory are based in Essex Junction, Vt. “Erica has…