Compare architectures, not isolated components
Start with the environment around the proposed room. If background temperature and humidity vary, a system that draws directly from that space inherits a changing inlet condition. A recirculating arrangement introduces a different set of return paths, conditioning requirements and service spaces.
Next decide how firmly the process must be separated from surrounding work. Rigid partitions offer a defined boundary for doors, windows and transfer devices. Curtains provide flexible access but need the surrounding activity and air movements to be considered carefully.
Make each quotation describe both the enclosure and the air route. Otherwise two packages with similar dimensions may solve different problems. Compare the service access and changeover work as well as the initial equipment list.
Configuration decisions
| Decision | What to define |
|---|---|
| Hardwall enclosure | Review cleanable joints, controlled openings and utility penetrations. |
| Softwall enclosure | Review curtain movement, access frequency and the surrounding room condition. |
| Single-pass air | Establish the source of incoming air and where discharged air goes. |
| Recirculating air | Reserve return routes, conditioning interfaces and access for maintenance. |
Can a hardwall room use a single-pass arrangement?
Yes, these are separate design choices. The combination must still be evaluated against process contamination, thermal requirements, background conditions and the required pressure relationships.