---
kind: "section"
citation: "46 C.F.R. § 169.315"
title: "46"
number: "169.315"
heading: "Ventilation (other than machinery spaces)."
url: "https://uscodex.org/cfr/46/169.315"
---

# §169.315. Ventilation (other than machinery spaces).

- (a) All enclosed spaces within the vessel must be properly ventilated in a manner suitable for the purpose of the space.
- (b) A means must be provided to close off all vents and ventilators.
- (c) Living spaces must be ventilated by a mechanical system unless it can be shown that a natural system will provide adequate ventilation in all ordinary weather conditions. Provided that [paragraph (a)](#a) of this section is satisfied, a vessel having only a natural ventilation system must satisfy the following: V/A≥1.4 where V is the total area of the vents in square inches and A is the product in square feet of the vessel's design waterline length times its maximum beam.

## Notes

### Authority

Authority: 33 U.S.C. 1321(j); 46 U.S.C. 3306, 6101; Pub. L. 103-206, 107 Stat. 2439; E.O. 11735, 38 FR 21243, 3 CFR, 1971-1975 Comp., p. 793; DHS Delegation 00170.1, Revision No. 01.4; § 169.117 also issued under the authority of 44 U.S.C. 3507.

### Source

Source: CGD 83-005, 51 FR 896, Jan. 9, 1986, unless otherwise noted.