Fire tests must be performed by an independent, internationally recognized laboratory. • There are 2 two portions of the test. • The first is the fire test. An operable door assembly is installed in front of a furnace and exposed to fire for a specified time. As the test progresses, the temperature is steadily increased to simulate the conditions of a real fire. The temperature and pressure of the door are monitored.The second is the hose stream test. Once the fire test is complete, the door is sprayed with cold water. The opening must stay secure.