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)
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.
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.
On 24 Carrot Island, the vent diagram is in a window near the roof. On Big Nate Island, the school blueprint is in Nate's locker. The secret map to the Time Capsule is under a rock on Seal-Saw Island.
this is on 24 carrot island.the blueprint for the air vent system should be stuck in the top boarded up window on the carrot cake(it's delicious!)factory.keep looking at the blueprint throughout the time you are going through the vents.
you get out of the freezer by going out the vent door!!!!!!!!!!!!!!!!!!!!!:)
It is the only way to leave the factory before you finish the game. This is only useful if someone has entered the factory without a vent blueprint (at some point the game would prompt you to go find a map). At the end of the game, you escape on a rope and don't need the transporter.
The Processing Room is on 24 Carrot Island on your right in the carrot factory.Before you entered the factory you will have gotten a blueprint of the vents.You will have entered from the surfice warehouse.Follow the directions and tada!You will have found the processing room!