Draft curtains or curtain boards increase the effectiveness of smoke vents by:
A. reducing the dissipation of the heated air currents from a fire and reducing the speed of operation of the vents.
B. reducing the dissipation of the heated air currents from a fire and increasing the speed of operation of the vents.
C. increasing the circulation of the heated air currents from a fire, but decreasing the speed of operation of the vents.
D. increasing the circulation of the heated air currents from a fire and increasing the speed of operation of the vents.
Ans: B. Reducing the dissipation of the heated air currents from a fire and increasing the speed of operation of the vents.
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