The ex officio member of a fire code board of appeals typically represents the Authority Having Jurisdiction (AHJ). According to fire code principles:

The AHJ serves as an advisory member to provide expert guidance on fire codes and regulations but does not have voting authority.

Jurisdiction's legal counsel (B): May assist with legal advice but is not considered an ex officio member.

General public (C): Does not typically fulfill the role of an ex officio member.

Appellant (D): Represents the party challenging a decision, not an ex officio role.

NFPA 1, Annex A.1.10: Guidelines for fire code board of appeals and ex officio roles