English Tech/Engineering Mechanics / Mech Engineering air conditioning

air conditioning, heat ventilation recovery

this is a table classifying types of rooms/buildings based on the required ventilation (cubic meters per hour)

First, building are subdivided in general categories, like "common household, dining places, inns and hotels, hospitals, schools, playhouses and movie theaters, plants, general buildings, comfort stations (?), dark rooms, guest rooms of ship"

then, each of the above categories is subdivided into subcategories. For example "plants" has the following subcategories:

"Office room
General work room
Telephone room
Spinning plant
Printing plant
Battery room
Machinery plant
Generator room
Substation room
Painting shop
Welding plant
Chemical plant
Food plan
Wood working plant
Casting plant"

...so, what might a spinning room be?
thanks!