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Flame jets are fire-spewing devices found in Magmoor Caverns. They are possibly a part of some form of exhaust system in the Caverns. Some constantly spew fire, while others will turn on and off at intervals. They can be frozen with the Ice Beam, rendering them useless for some time. Their name originates from concept art of the game. They are only found in Pit Tunnel, Fiery Shores, Lake Tunnel, South Core Tunnel and Transport Tunnel C.
Metroid Prime and Metroid Fusion: Prima's Official Strategy Guide refers to them as "flame geysers".
In Metroid Prime 3: Corruption, several vents release flame on the Spider Ball Tracks of the Podworks. These can harm Samus if she comes in contact with them, and knock her off the Tracks.
In Metroid: Other M, two rooms of the experimental simulated desert area feature multiple mechanisms that release fire similar to flame jets, although these are exhaust vents.
In Metroid: Samus Returns, certain Wallfires will breathe fire towards Samus if she approaches them.