On the factory floor, it is at upper right. Turn on the power switches (middle one all the way down, the other two halfway) and ride the claw crane at the top of the room. When you reach the right side, jump off and enter the vents.
You *must* have the vent blueprints from the roof window outside. You can use the Carrot Transporter to get it.
in the air vent
There is no vent room on Cryptids Island. There are vents on 24 Carrot Island.
the factory, get the crowbar to open the vent
You get a item the allows you to get out of the factory on 24 Carrot island. It"s like a carrot-like control.
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).
you get out of the freezer by going out the vent door!!!!!!!!!!!!!!!!!!!!!:)
The blueprint is on the Factory roof in a boarded window. (see related question)
The blueprint for the vent system is in a window on the outside, near the top of the factory.
If you need to go out and come back (for the vent blueprint), use the Carrot Transporter. Otherwise, completing the game provides your exit.
It is rolled up in one of the boarded windows atop the Carrot Cake Factory. It shows how you can get to the various rooms in the factory. (see related question)
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.