A simple vent for equalizing the temperature between two rooms without allowing people to walk between them.
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A vent conducts some of the temperature from one room to another room. It structurally acts like a wall to separate rooms and it supports a roof. Placement of a vent requires open space on its two sides -no walls, you can place any building though-. The blueprint can be laid atop an existing wall; the wall is replaced upon construction. The placement of multiple vents along a wall increases the temperate transference.
In Alpha 17 they can be opened and closed with a simple flick action.