46 CFR 32.56-60
§ 32.56-60 Ventilation ducts—T/ALL.
United States · 46 CFR — Shipping · Status: effective
Cite this
- Citation
- 46 CFR 32.56-60, § 32.56-60 Ventilation ducts—T/ALL, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/224280
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Full text
(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.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.