---
kind: "section"
citation: "46 C.F.R. § 32.56-60"
title: "46"
number: "32.56-60"
heading: "Ventilation ducts—T/ALL."
url: "https://uscodex.org/cfr/46/32.56-60"
---

# §32.56-60. Ventilation ducts—T/ALL.

- (a) Each duct for ventilation of Category A machinery spaces that passes through accommodation, service, or control spaces must be:
  - (1) Constructed of steel and insulated to “A-60” Class; or
  - (2) Constructed of steel, fitted with an automatic fire damper at each boundary where it enters and leaves the Category A machinery space, and insulated to “A-60” Class for a distance of 5 meters (16.4 feet) beyond each machinery space boundary.
- (b) Each duct for ventilation of accommodation, service, and control spaces that passes through Category A machinery spaces must be constructed of steel and be fitted with an automatic fire damper at each Category A machinery space boundary.

## Notes

### Source

Source: CGD 74-127, 41 FR 3844, Jan. 26, 1976, unless otherwise noted.

### Authority

Authority: 46 U.S.C. 2103, 3306, 3703, 3719; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; DHS Delegation No. 00170.1, Revision No. 01.4; Subpart 32.59 also issued under the authority of Sec. 4109, Pub. L. 101-380, 104 Stat. 515.

### Source

Source: CGFR 65-50, 30 FR 16671, Dec. 30, 1965, unless otherwise noted.