Final answer:
For adding a fryer and increasing vent size, the operation should contact the regulatory authority first to submit paperwork, and after remodeling, have the work inspected by a building inspector for compliance.
Step-by-step explanation:
If an operation wants to add another fryer and increase air vent size, they should primarily contact the regulatory authority and submit the necessary paperwork. This is because any changes that involve building structure, ventilation, and fire safety may require permits and adherence to specific codes and standards which are under the jurisdiction of the local regulatory authority.
After securing the initial permissions and undergoing the remodeling, they would typically need to have a building inspector visit the facility to ensure the work has been completed according to the approved plans and is in compliance with all relevant safety and building codes. Contacting the building inspector is often the business owner's responsibility, and in some cases, the contractor performing the work may coordinate with the inspector. The inspector provides the final approval indicating the remodel meets all requirements.