Level 1
Ventilation duct suspended from the ceiling. The air duct passes through part of the room, providing the natural movement of air flows. It is necessary for the installation of "smoky" zones where the output of combustion products is required.
Items
Level 2
A basic ventilation duct with additional emergency bunker ventilation system of external airflow. Now, besides the removal of combustion products, there will be fresh air in the Hideout.
Stations
Level 3
A ventilation duct fitted with electric fans to increase the airflow rate. A complete air circulation system is needed for advanced production and chemical research.
Items
Stations
Skills
Strength · Level 2