Doorway Tanks are very narrow, and made to fit through conventional doorway frames: 30-36" typically. They can still be fairly tall however - as seen in the chart below - so can hold a lot of liquid. Usually made from polyethylene, Doorway Tanks are safe for potable water or chemical storage uses. Doorway Tanks are often called Slimline Tanks, Wall Tanks or Freestanding Tanks.
Percheron Plastic is here to help. Owners Matt Tanguay and Eric Quane are experts in plastic tanks, and are happy to advise and discuss what you might need - in a guaranteed, non-pushy manner. They have decades of experience, and will make sure you're well informed.