Fluid Bed Roasters: Instead of utilizing a roasting drum to heat and mix the beans, a fluidized bed roaster heats the beans using a continuous stream of high-temperature air that blows into the roasting chamber. Instead of the drum’s rotation (so it feels like they’re boiling) while stirring them up.
Because the Fluid-bed roaster does not have its cooling mechanism and instead relies on the built-in hot air blowing system (which turns off the furnace’s heat source), the cooling efficiency is low (because the device is still boiling).
As a result, the operator must either sacrifice the quality of the coffee using the default cooling method or install a suitable cooler.