What are regulations for Ventilations on ships as per SOLAS ?

(i) Constructed of steel in accordance; and

(ii) Insulated to A-60 standard throughout the accommodation spaces, service spaces or control stations.

(4)Ducts provided for ventilation to accommodation spaces, service spaces or control stations shall not pass through machinery spaces of category A, galleys, car deck spaces, Ro/Ro cargo spaces or special category spaces unless  

   A.(i) The ducts where they pass through a machinery space of category A, galley, car deck space, Ro/Ro cargo space or special category space are constructed of steel;
     (ii) Automatic fire dampers are fitted close to the boundaries penetrated; and
    (iii) The integrity of the machinery space galley, car deck space, RO/Ro cargo space or special category space  boundaries is maintained at the penetrations or