Iranian Classification Society Rules
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Section 7 Companion Way
701. Companion way
A sufficient means for safe passage of crew shall be fitted around all exposed deck. 
Ch 9
Table 9.2 Height of sill (mm )
Ä Position | Ä ≧ 30 m | Ä < 30 m |
I | 900 | 760 |
II | 760 | 450 |
Table 9.3 Coaming height of ventilator (mm )
Ä Position | Ä ≧ 30 m | Ä < 30 m |
I | 450 | 300 |
II | 300 | 150 |