Trading as Officine Brevetti Sisti since 1960, Sisti Engineering builds sliding and hinged fire doorsets for industrial and technical buildings and describes itself as one of the first Italian firms to certify fire doors. Its BS 217 sliding fire door is certified to EN 16034:2014 with EN 13241:2016+A2:2016 and classified EI1 60 and EI2 60. The firm’s certification pages set out the wider CE framework it works to — EN 16034 for fire resistance and smoke control, EN 13241 for industrial, commercial and garage doors, and EN 14351 parts 1 and 2 for pedestrian doorsets — alongside the Italian omologazione ministeriale under D.M. 21 giugno 2004. Quality management is certified to ISO 9001:2015 under certificate SQ041804, held since 2004. The notified body is not named on the public pages.