draft curtain

curtain board, draft curtain

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.
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The project also consists of the installation of an 18 draft curtain wall at the top of the west stair on level 2.
Specifics regarding fire sprinklers, smoke vents, draft curtains, and hose rack.
What effect do automatic roof heat and smoke vents and draft curtains have on the performance of automatic sprinkler systems?