The blueprint for the vent system is in a window on the outside, near the top of the factory.
on the map
He is at the carrot factory.
its on the window on the factory make a big leap to it
on the factory window
Ratman is on Super Power Island. There is a large rat in the sewer entrance to the factory on 24 Carrot Island (climb up into the bypass pipe to elude him).
fight
it is on the 24 carrot island on the gas station
the processing room is in the vents and the map will say where the processing room is :)
24 Carrot Island is the 4th island of Poptropica. It came out in June, 2008.
The mayor of the town on 24 Carrot Island will give you the Island Medallion when you complete the quest.
go to your map up in the right corner it will say 24 carrot.
right beside the cafe place.