This section of the Guidelines is intended to serve as a guide when decisions are made on whether to accept partially weathertight hatchway covers on board containerships in accordance with SOLAS regulations II-2/10.7.1.1 and II-2/20.6.1.1, and the relevant provisions of the Fire Safety Systems Code (chapter 5, paragraph 2.2.1.1), taking into account the leakage of carbon dioxide fire-extinguishing media through clear gaps between hatchway covers.