Ventilation caps or covers were installed throughout the Frigate Orpheon in Metroid Prime. They covered ventilation shafts, but were supported by very unstable coils. During the countdown, they frequently exploded, providing Samus alternate exits as she raced to escape the Orpheon before it crashed into Tallon IV. They explode if Samus approaches them.
Ventilation caps appear in Biotech Research Area 1, Deck Beta Transit Hall, Cargo Freight Lift to Deck Gamma, Subventilation Shaft Section B and Main Ventilation Shaft Section A. They are also present on the Sidehopper Station stage in the Metroid Prime 2: Echoes Multiplayer, which is modelled after the Frigate Orpheon.
- Biotech Research Area 1
- "The coils on this ventilation cap look unstable."
- Deck Beta Transit Hall
- "Ventilation covers may become superheated if airflow is restricted. Unusual thermal readings should be reported to the deck engineer on duty."