The "Z" system provides the greatest pressure differential accross the goaf and gives the most flexibility for the use of dilution intakes. It is used in coal seams that have a very high gas content ( > 10 m3/t ), this type of ventilation system is used in Appin Colliery which has a gas content of 55 m3/t. Also known as "Y" as the air path is a similar shape to the letter "Y".
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