What are regulations for Ventilations on ships as per SOLAS ?

(i) constructed of steel having a tickles of at least 3 mm and 5 mm for ducts the widths or diameters of which are up to and including 300 mm and 760 mm and above respectively and, in the case of such ducts, the widths of diameters of which are between 300 mm and 760 mm having a tickles to be obtained by interpolation.                 (ii) Suitably supported and stiffene                                                                                                         (iii) Fitted with automatic fire dampers close to the boundaries penetrated; and   (iv)Insulated to A-60 standard from the machinery spaces, galleys, car deck spaces Ro/Ro cargo spaces or special category spaces to a point at least 5 m beyond each fire damper;