Ash Forge

The Ash Forges, known to the public as the Hornwright Air Purifier Systems or just as air purifiers, are world objects and cut constructible workshop objects in Fallout 76.

Background
Ash Forges were designed using technology from the Clear Skies Alliance originally meant help purify the air and lessen the environmental damage done by the Appalachian mining efforts, such as the Rockhound installed atop Mount Blair which polluted the southern region of Appalachia by filling the air with soot and ash from the strip-mining the mountaintop. The Clear Skies Alliance approached Hornwright Industrial to partner in an endeavor to remove harmful particles from the air and improve health and living conditions.

Daniel Hornwright, the Hornwright CEO, accepted the offer only when his daughter and senior operations executive, Penelope Hornwright, discovered the air purifiers could instead be used to pull heavy metals out of the air by ionizing particles and convert them into usable minerals. The marketing department dubbed these altered machines "Ash Forges." 

Around 20 years after the Great War, Jen and the Foundation Settlers were planning to pick apart one of the air purifiers in order to make them work again.

Characteristics
The Forges appear as tall, cylindrical fans. At the base of the fan is a terminal which the player character can interact with. The terminal cannot be used to activate the forge.

Ash Forge sites
The Ash Forges are grouped into 4 sites, arranged around Mount Blair in a clockwise fashion.
 * Hornwright air purifier site 01, located northeast of Mount Blair, next to The Rusty Pick; it has two Ash Forges.
 * Hornwright air purifier site 02, located east of Mount Blair, next to Lewisburg; it has two Ash Forges.
 * Hornwright air purifier site 03, located east of Mount Blair, close to the Red Rocket filling station; it has two Ash Forges.
 * Hornwright air purifier site 04, located west of Mount Blair, next to Beckley; it has three Ash Forges.

Cut content
Correspondence from Dominick Heyward to Penelope indicates that Hornwright Industrial capitalized on the ability to gather aerosolized minerals by setting fire to old, toxic mines and further contaminating the air around Mount Blair. There is also an unused holotape, in which Edith Bachmann informs Penelope about energy shortages delaying progress on the air purifier project.

It was originally intended for player characters to crack Heyward's locked terminal, gaining access to the ash forge system, and starting the Old Flames quest, during which the Vault Dwellers would activate the forges, deposit "precursors" at target burn sites, and then harvest the raw materials from the air. The quest was ultimately cut, but the Forges and several terminals referencing their alterations from simple air purifiers were left in-game. The Forges could optionally collect iron, black titanium, aluminum, coal, copper, lead, gold, silver, uranium, or Ultracite.