Final answer:
The type of vent that must terminate 5 feet in vertical height above the highest connected draft hood or flue collar is called a vent stack or main vent in plumbing.
Step-by-step explanation:
In plumbing, the type of vent that must terminate 5 feet in vertical height above the highest connected draft hood or flue collar is called the 'vent stack' or 'main vent'.
A vent stack is a vertical pipe that allows air to enter the plumbing system and equalize pressure. It helps prevent sewer gases from entering the living space and ensures proper drainage.
By terminating the vent stack 5 feet above the highest connected draft hood or flue collar, it ensures that the vent pipe is tall enough to create sufficient airflow and prevent any backflow of gases.