code/modules/mapping/dynamic_airlocks.dm 
| /obj/effect/map_effect/dynamic_airlock | A mapping helper that defines the zone of a dynamically arranged airlock chamber. This can be used as an alternative to /obj/effect/spawner/airlocks. |
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| /obj/effect/map_effect/dynamic_airlock/door | A helper used to indicate what doors are connected to an airlock zone. Comes in interior and exterior variants as subtypes. |