curtain board

curtain board

[′kərt·ən ‚bȯrd]
(building construction)
A fire-retardant partition applied to a ceiling.

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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References in periodicals archive ?
Invitation to tender : General carpentry: balustrade and Leibungsverkleidungen, cornices and curtain boards at windows.