func_fire_extinguisher

Code classes:

• CFuncFireExtinguisher
• CBaseTrigger (triggers)
• CBaseToggle
• CBaseEntity (all ents)

func_fire_extinguisher is a brush entity present in Left 4 Dead. According to the FGD, this entity has nothing to do with fire and, in fact, just fades out ragdolls which are inside its volume.