Generally, we use these different air flow systems in cleanrooms:
- Pressurized Plenum or Interstitial Area — Air is pumped into the interstitial area and filters push the air down into the cleanroom.
- Ducted Supply and Ducted Return — The air is ducted to and from the cleanroom.
- Ducted Supply and Open Return — The air is ducted into the cleanroom and flows to an open return.
- Negative Pressure Design — This configuration prevents contaminants from entering the surrounding area. The air is exhausted to a safe location.
Cleanrooms are also referred to as “once-through” and “recirculating” design.