fire door

a door through which a boiler or furnace is fired or through which the fire is inspected.
a fireproof or fire-resistant door in a building, intended to isolate an area from fire.

1830–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fire door
1.  a door made of noncombustible material, the purpose of which is to prevent a fire from spreading within a building
2.  a similar door, leading to the outside of a building, that can be easily opened from inside; emergency exit

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Make sure any opening into an exit through a fire wall is protected by a
  self-closing fire door that remains closed.
Openings must be protected by a self-closing, approved fire door that remains
  closed or automatically closes in an emergency.
Fire door maintenance deficiencies reportedly had been brought to the attention
  of plant management before the fire.
Any opening therein shall be protected by an approved self-closing fire door.
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