46 CFR § 78.47-75
Ventilation alarm failure
April 15, 2021
(a) The alarm required by §72.15-15 (c)(4) of this subchapter, which indicates the loss of required ventilation in spaces specially suitable for vehicles, shall be marked with a conspicuous sign in at least 1⁄4 -inch letters “VENTILATION FAILURE IN VEHICULAR SPACE.”
(b) [Reserved]
[CGFR 66-33, 31 FR 15284, Dec. 6, 1966]