Clean rooms designs can typically be divided into two distinct types.

  • Closed systems which utilise a plenum and air recirculation system.

  • Open ceiling systems with softwalls/hardwalls with partitions.


Closed system with an air plenum, a recirculated air-flow and an air conditioning system

  1. Filter Section (closed)
  2. Modular Base Frame 
  3. Cleanroom Ceiling 
  4. Fan Filter Unit (FFU) 
  5. Return-Air Filter 
  6. Softwall Curtain or Single Shell Hardwall (inside) 
  7. Cleanroom 
  8. Outer Cleanroom 
  9. Air Plenum 
  10. Partition Walls/Frame 
  11. Outer CR ceiling 
  12. Return-Air approx. 15% 
  13. Supply Air (Conditioned) 
  14. Fresh-Air approx. 10% 
Figure 1 - Closed system with an air plenum, a recirculated air-flow and an air conditioning system (Click to Enlarge)

Figure 1 - Closed system with an air plenum, a recirculated air-flow and an air conditioning system (Click to Enlarge)


Open ceiling system with either softwall curtains or hardwall partitions 

  1. Filter Section 
  2. Modular Base Frame 
  3. Cleanroom Ceiling 
  4. Fan Filter Unit (FFU) 
  5. Pre-Filter of FFU 
  6. Softwall Curtain or Single Shell Hardwall 
  7. Cleanroom 
Figure 2 - Open ceiling system with either softwall curtains or hardwall partitions (Click to Enlarge)

Figure 2 - Open ceiling system with either softwall curtains or hardwall partitions (Click to Enlarge)