Sorry Clam, this is what I get when clicking your link:
Sorry, this site is temporarily unavailable!
The web site you are trying to access has exceeded its allocated data transfer. Visit our help area for more information.
Access to this site will be restored within an hour. Please try again later.
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.