This is a picture of the testing chamber. When the front door is closed, the smoke builds up inside the sealed chamber for a specified time. A light source on the bottom of the chamber projects upward towards a photometer. This photometer calculates how much light is obscured by the smoke generation during the test.
On the picture above, the orange glow is the sample location. It is held in the vertical position with a small set of pilot flames along the bottom for the "flaming mode". During the non-flaming mode the pilot flames would not be there.