Location Function Creator The vent switch is a Precursor artifact in The Precursor Legacy. By stepping on the top of the device, Jak can activate eco vents around the world according to the switch's color orientation. There were only two vent switches seen in the game; one in Forbidden Jungle which activated the blue eco vents, and one in Snowy Mountain which activated the yellow eco vents. Each of them were unlocked in their respective mission; "Find the blue vent switch" and "Find the yellow vent switch", both of them also held a power cell in place on top of the switch.