ventilation

Underground mine ventilation provides a flow of air to the underground workings of a mine of sufficient volume to dilute and remove noxious gases.

Name	Costs
Ventilation	1200 1400 1300 1200	0	01d12h40m

Ability
Provides	Requires
+5% Resource production workforce - Iron to user Ventilation technology	User has not Ventilation technology Building is Guild House User has Sub Surface Mining technology

City Buildings to research
Name	Construction Costs			Gold Production	Culture Points	Trade Points
Guild House	2200 2300 1850 2000 1400	0	08d16h20m	0	40	20

Ventilation techtree