Fanzun is a Graubünden-based multidisciplinary architecture and engineering firm with an identifiable fire-protection department led by a VKF fire-safety expert. The team handles fire-safety quality assurance (levels 1–3), integral testing and fire-response, warm-smoke tests, and smoke-extraction and evacuation verifications, acting as the point of contact with the fire authorities. Its fire-engineering work is an aid to professional judgement, not a substitute.