Civil Engineering - Tunnelling - Discussion

Discussion Forum : Tunnelling - Section 1 (Q.No. 16)
Pick up the mechanical ventilation method used for tunnels from the following:
blowing fresh air by ducts to the face of tunnel
exhausting foul air by ducts from the face of the tunnel and permitting fresh air through the tunnel
blowing fresh air and exhausting foul air by ducts
all the above.
Answer: Option
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