The Ventilation System is an important game mechanic in Five Nights at Freddy's 3. If the ventilation goes down, the player may experience hallucinations such as the phantom animatronics. Red lights will blare and bring the Springtrap closer, as he is noise sensitive. The ventilation can be reset by going to the panel on the left, bringing it up, and clicking it. This will take time. Resetting the systems before-hand don't help.