Different clean room concepts such as negative pressure plenum or circulating air operation can be implemented by FFUs from Weiss. Besides supplying larger clean rooms, FFUs are also suitable for implementing clean room islands or clean workstations. Predictable changes in use or changing process sequences in clean rooms require a flexible clean-air supply system. A concept using FFUs is ideal for this, in order to realize a clean room concept adapted to the process requirements by an easily altered arrangement of FFUs, lighting and ceiling panels.

Upgrading of clean rooms to a higher clean room classification can also be implemented very easily by increasing the number of FFUs. Using the various open-loop and closed-loop control Systems employed by Weiss, appropriate control systems, even computer-aided systems, can be implemented for FFU applications ranging from simple ones to complex facilities with hundreds of FFUs.