Clean Dry-Air System

Clean dry air (CDA) and facility-wide nitrogen purge systems both supply a controlled, contamination-free gas throughout the fab's infrastructure — CDA for pneumatic actuation and general tool-air needs, and nitrogen purge for keeping sensitive spaces and enclosures free of moisture and oxygen at a facility-wide scale, distinct from the FOUP-specific purging covered elsewhere.

Fab infrastructure needs clean gas for pneumatics and purging, distributed everywhere
Ordinary compressed air or ambient nitrogen isn't clean or dry enough
Facility gas infrastructure
Clean dry air (CDA)
Filtered, dried compressed air for pneumatic valves, actuators, tool air needs
Facility nitrogen purge system
Supplies inert, dry nitrogen broadly for enclosure/space purging at scale

CDA has to be both clean and dry because moisture or particles riding along in compressed air used for pneumatic actuation can directly cause valve and actuator failures. A pneumatic valve or actuator relies on compressed air to move reliably; if that air carries moisture, it can condense inside the pneumatic mechanism and cause corrosion or sticking, and if it carries particles, those can abrade seals or jam moving parts — CDA systems filter and dry compressed air specifically to prevent both failure modes across every pneumatic device the fab's tools depend on.

Clean Dry Air and Facility Nitrogen — Infrastructure-Scale Gas Supply pneumatic reliability and facility-wide inert purging CDA — pneumatic actuation valve/actuator moisture/particles here cause mechanical failures Facility N2 — broad purging enclosures, storage spaces purged at scale distinct from the FOUP-specific purge station covered elsewhere — this is the facility-wide supply feeding it

Facility nitrogen purging operates at a completely different scale than the FOUP purge discussed elsewhere — it's the actual supply infrastructure that feeds individual FOUP purge stations and many other inert-atmosphere needs throughout the fab, not a single point-of-use application. The same facility nitrogen distribution network that feeds FOUP purge ports also supplies glovebox atmospheres, enclosure purging, and other inert-gas needs across the fab, making this facility-level system the shared infrastructure layer underneath every one of those more specific, point-of-use nitrogen applications.

Clean dry air and facility-wide nitrogen purge systems both provide fundamental, infrastructure-level gas supply that countless individual tools, pneumatic mechanisms, and point-of-use purge applications across the fab all depend on, making them foundational utilities rather than process-specific equipment in their own right.

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