1) Where wood is burned 2) Wood-burning unit 3) Wood-residue factory 
An ashery is a factory that converts hardwood ashes into lye, potash, or pearlash. Asheries were common in newly settled areas of North America during the late 18th century and much of the 19th century, when excess wood was available as settlers cleared their land for farming. Hardwood ashes contain abundant levels of potassium carbonate and potas...
• (n.) A depository for ashes. • (n.) A place where potash is made.
Ash'er·y noun 1. A depository for ashes. 2. A place where potash is made.