Vault vent covering

The  is a type of decorative item used in the Vault-Tec Vaults. A covering covers a horizontal or vertical vent. The vent covering is a large circle with sloping sides wall-mounted to a wall by eight bolts. Five slats, angled down, are within the covering. Vent coverings are located in corridors and rooms. Some vents are placed in recesses in corridors. These vent coverings were used by Vault-Tec engineers for concealing a vent and for safety.

Vault 101
On August 3, 2274, Andy is repairing a vent near the Clinic.