Tennessee Code Title 62. Professions, Businesses and Trades § 62-32-205

(a) No portable fire extinguisher or fixed fire extinguisher system may be leased, sold or installed in this state unless it carries a label of approval of a testing laboratory approved by the department.

(b) Except as provided in § 62-32-206, only the holder of a current and valid certificate of registration or an extinguisher specialist license issued pursuant to this part may service portable fire extinguishers or install or maintain fixed fire extinguisher systems.

(c) A person who has been issued a license pursuant to this part to service portable fire extinguishers or install and service fixed fire extinguisher systems must be an employee, agent or servant of a firm that holds a certificate of registration issued pursuant to this part.

(d) A certificate of registration, license or permit issued under this part is not transferable.