Tunnel Engineering | Methods of tunnel ventilation | Mechanical method of Tunnel ventilation |

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[@ghorijaynesh40]

blowing nhi kiya

[@Wanderer78898]

Proper btya ni apne exhausting and blowing kase install hota ha kaha pe install hota ha

[@littlesalman477]

Thank You So much Brother 😊

[@Digitecheducation]

Most welcome 😊