  | Gas 
Supply/Distribution | 
   | - 
Gas supply cabinets  - Valve manifold boxes  - Gas piping runs |  
 | 
    | Chemical 
Supply & Distribution | 
   | - 
Chemical storage room  - Chemical delivery/service corridors |  
 | 
    | Wafer 
Processing/Clean Room | 
   | - 
Tool gas jungle  - Gas isolation panels  - Breathing zone |  
 | 
    | Abatement/Tool 
Exhaust/Equipment Room | 
   | - 
Pollution abatement systems  - General tool exhaust  - Vacuum pump enclosures |  
 |