draft stop

draft stop

A building material installed to prevent the movement of air, smoke, gases, and flame to other areas of the building through a large concealed passage, such as a suspended ceiling.
References in periodicals archive ?
The draft stop was instrumental in preventing the spread of the fire.
Using strong language such as "deplores" and "condemns," the Saudi draft stops just short of recommending actions such as economic or military sanctions, as it knows that nobody would buy its words and demands without providing substantiating evidence, or at least one single proof, for such a shocking accusation.
Is it really that difficult to conclude that any national standard, in any subject, should be revised upward if its first draft stops short of the best, proven standards already available in Massachusetts, Illinois or California?