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Chinese proverb "Print with #3.5 and burn with #1.5." B.J. Confucius
I hope you plan on more than a partial barrier between the laundry and the darkroom. That can be a source of incessant lint. Best be sure there is positive pressure on the darkroom side to push the lint out vents near the dryer. Also make some provision for humidity control, all that moisture tends to rust the expensive equipment in the darkroom.