If the length to diameter ratio exceeds 15, it is often best to support the rotary kiln on three roller stations.

Variable-speed electromechanical drive systems with planetary gearbox, splined tyres, pneumatic inlet and outlet seals, air-cooled inlet trough, hydraulic axial thrust system etc. are proven components of both the 2-support kiln and the 3-support kiln.

Depending on the process-technological requirements, rotary kilns can be equipped with e.g. peripheral tertiary air blowers, which ensure the controlled infeeding of combustion air in a reduction process. Other modifications are also possible; for instance co-rotating burner systems or gas injection systems.