Mission: The Exhaust Fan

The Exhaust Fan is a main mission.

This mission is part of the Somber Marsh plotline.
 * 1)  Road to the Marsh
 * 2)  The First Key
 * 3)  The Second Key
 * 4)  The Exhaust Fan
 * 5)  The Third Key

Overview
The player must have completed  The Second Key.

Required stations
The player must have the following to complete this mission:
 * Level 3 Worktable
 * Level 2 Assembly Station
 * Industrial Furnace
 * Electric Furnace
 * Industrial Cutter or Comprehensive Cutter

Conduct of the mission
The next morning, Ursula is waiting outside the player's house. She informs the player that they have already scouted the third location but requires the builder's skills.

Regardless of the choice, Ursula demands the player build the Exhaust Fan immediately and gives the diagram.
 * Sure!
 * Not right now.

Assemble and Install
The following materials are needed to complete this mission:

Assemble the items at the Assembly Station and install the Exhaust Fan at the location marked on the map. The location of the third key is located northwest of the Somber Marsh, using the western route from the Tree Farm.

Talk with Ursula
After installing the Exhaust Fan, the player needs to speak to Ursula to complete the mission.

Post-conduct
After installing the Exhaust Fan, the gas will dissipate after a few days. Once cleared out, Ursula sends a letter to the player to meet the team at the third ruins for the next operation, commencing  The Third Key.