How to pronounce upcast in English?

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upcast::noun | Spocien Dictionary

upcast

/'əp,kæst/

air passage consisting of a ventilation shaft through which air leaves a mine

Type	Words
Type of	air duct, air passage, airway

upcast

Stoves were installed at the bottom of upcast pipes to overcome the problem of ventilation.

From the en.wikipedia.org

Similar to Dutch, the English origins of the word lie in digging a trench and forming the upcast soil into a bank alongside it.

From the en.wikipedia.org