The Arkay Fumes Vent is an option for your backsplash. It is used to help rid your darkroom of bad odors. This optional piece of equipment must be ordered at the time of purchase of your backsplash. It is also important to point out that it must be connected to some kind of exhaust/fan system since the vent itself is only a hole. It is the fan that will remove the odors from the room.