Section 78.47-75 - Ventilation alarm failure(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."CGFR 66-33, 31 FR 15284, Dec. 6, 1966