CFR /  Title 46  /  Part 153  /  Sec. 153.351 Location of 4m vent discharges.

Except as prescribed in Sec. 153.353, a 4m venting system must discharge:

(a) At least 4m (approx. 13.1 ft) above the higher of:

(1) the weatherdeck; or

(2) any walkway that is within a 4m (approx. 13.1 ft) horizontal radius from the vent discharge.

(b) At least 10m (approx. 32.8 ft) from air intakes for, or openings into, accommodation or service spaces. [CGD 78-128, 47 FR 21208, May 17, 1982]