46 CFR §78.47-53
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
- (a)The manual operating positions for automatic fire dampers in ventilation ducts passing through main vertical zone bulkheads shall be identified by red day light-reflecting letters at least 1/2 inch high “VENTILATION FIRE DAMPER.” In addition, the open and closed positions shall be similarly marked.
- (b)[Reserved]