;(b) if the opening is a doorway, meet the requirements set out in section 3; or(c) if the opening is a funnel or machinery space ventilator that needs to be kept open for the essential operation of the vessel, be fitted with a coaming at a height above the deck of at least(i) 3.8 m in Position 1, or(ii) 1.8 m in Position 2.AIR PIPES7. (1) If air pipes to tanks extend above the freeboard deck or s