curtain board, draft curtain meaning

• [Architecture]
  

  A substantial noncombustible curtain, hung tightly against a roof or ceiling along the perimeter of a special-hazard area; acts as a partition in directing heat and smoke within the curtained area toward vents and preventing the spread of fire.

• draft curtain:    [Architecture]See ...
• curtain board:    [Building construc ...
• curtain:    Noun: curtain  ...