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The air purifier site is one of four sites where Hornwright Industrial set up the air purifiers - in reality modified to act as tools for converting aerosolized minerals back into solid form.
This small set up is where the Hornwright Industrial Mining Company set up their air purifiers, ostensibly to clean up the Ash Heap created in the wake of stripping down Mount Blair. The concrete building contains a tinker's workbench and a clothes spawn point.
Hornwright air purifier site #03 appears only in Fallout 76.