Semi-rigid fibrous glass blankets attached to the insides of the ducts are in place to mainly

Semi-rigid fibrous glass blankets attached to the insides of the ducts are in place to mainly

Semi-rigid fibrous glass blankets attached to the insides of the ducts are in place to mainly



a) restrict spread of smoke
b) insulate
c) act as fire retardants
d) attenuate airborne noises
e) stop leakage in the seams of the duct work


Answer: D


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