A repulsor vent served as a barrier against the poisonous lava fumes originating from Mustafar. To safeguard organic beings from inhaling the harmful fumes, the Klegger Corp Mining Facility foundry incorporated a repulsor vent system. Following an eruption of lava fumes within the recently constructed Fortress Vader that caused mental instability among its Imperial lava troopers, the Imperial officer dispatched to address the situation advised Darth Vader that the Empire should abandon his fortress until the installation of environmental filtration systems. Ultimately, the lava fumes were contained and kept out of Darth Vader's castle, despite lingering traces continuing to infiltrate its dungeons.