English: Pulp and paper mill basement, 1980's Sault Ste. Marie, Ontario, Canada. The manufacture of paper necessitates the generation of lots of humidity, which can result in housekeeping and corrosion challenges. Notice the ABS plastic pipes right inside the noncombustible building as per Part 3 of the Ontario Building Code. original description: “Pulp and paper mill, below a paper machine, in the basement. Lots of airborne humidity presents a housekeeping and corrosion prevention challenge. Sault Ste. Marie, Ontario, Canada, 1980's.”