Is the answer 'Yes' to either of these questions:
5.4.5. A portlight fitted below the weather deck and not provided with an attached deadlight should be provided with a 'blank' (the number of blanks should be sufficient for at least half of the number of such portlights of each different size in the vessel), which can be efficiently secured in place in the event of breakage of the portlight. The blank should be of suitable material and strength to the satisfaction of the Certifying Authority.
Such a 'blank' is not required for a non-opening portlight.
5.4.2. A window fitted in the main hull below the weather deck should meet the requirements of Section 5.4.2, or be provided with a blank meeting the requirements
5.4.7. In a vessel which operates more than 60 miles from a safe haven, portable 'blanks' for windows should be provided (the number of blanks should be sufficient for at least half of the number of such windows of each different size in the vessel) which can be efficiently secured in place in the event of breakage of a window.
Such a 'blank' is not required for a window which satisfies Section 5.4.2.
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