shot-firing curtain

shot-firing curtain

[′shät ¦fīr·iŋ ‚kərt·ən]
(mining engineering)
A steel frame with chains about 6 inches (15 centimeters) apart suspended from the roof about 9 to 12 feet (2.7 to 3.7 meters) from the face of an advancing tunnel to intercept flying debris when shot-firing at the face.