When sourcing a Fluid Bed Dryer (FBD), you must prioritize drying efficiency and material compatibility. Key specs include the air distribution plate design, which ensures uniform fluidization, and the heating capacity (steam, electric, or gas). For pharmaceutical or food applications, ensure the machine is made of SUS304 or SUS316L stainless steel with a mirror-polished finish (Ra < 0.4μm) to prevent material accumulation. Additionally, verify the fan motor power and noise levels, as high-performance blowers are essential for handling high-density powders.