Finally, after they have mastered the design of the GenieDome, they completed the ensemble by "closing the hatch" of the kitty poop pod (LOL). The GenieDoor helps contain the smell after kitty has "dropped a bomb" until the unit begins the wash cycle. It also helps during the drying cycle by holding the heat inside of the enclosure aiding the drying process. Plus my cats seem to enter/exit a little slower, which helps prevent granules from being tossed out of the unit. Overall, a great addition to a fantastic invention! Keep the ideas coming, PetNovations!!