A bright red fire door.
fire door definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
☆ a door of metal or other fire-resistant material designed to keep a fire from spreading
fire door definition by American Heritage Dictionary
A door made of fire-resistant material that can be closed to prevent the spread of fire.