Final answer:
A fire-rated door uses a fusible link that melts from the heat of a fire to function.
Step-by-step explanation:
The type of fire door that uses a fusible link that melts from the heat of a fire to function is called a fire-rated door. A fire-rated door is designed to withstand the intense heat of a fire for a specified period of time, usually measured in hours. When the temperature of the fire reaches a certain level, the fusible link in the door's mechanism will melt, causing the door to close and seal off the area from the fire.