Giustini Adolfo is a metal-fabrication workshop at Rufina near Florence, trading since 1860, whose fire-door work is backed by two separate UNI 11473-3:2014 certifications named on its certifications index: ICIM as Manutentore Addetto Responsabile and RINA as Installatore Addetto Responsabile. That is the Accredia-accredited scheme for installers and maintainers of fire-resisting and smoke-control closures, and it is the credential the Italian market otherwise keeps invisible — its holders are listed only in a captcha-gated database. The firm is separately an authorised installer for Ninz doorsets. Fire-door work sits within a broader ironwork and sheet-metal business, and no certificate numbers or expiry dates are published.