refrigeration shaft mining.

[Iskanderung]

Помогите перевести фразу refrigeration shaft.

Контекст: XXX is providing full EPCM services for the design and development of the YYY No.17 Shaft project, known as the ‘fourth generation’ shaft complex to reach depths of between 1600m and 2000m. The project entails the sinking of three vertical shafts, the main, the vent, and the refrigeration shafts together with a 43m Bulk Air Cooler (BAC) Shaft, and all associated tunnels.

[Lonely Knight]

не гуглится ствол охлаждения или вентиляционный ствол?
описание:
“The refrigeration shaft, being 6 m in dia- meter, will downcast cooled air at 3 ºC from a refrigeration plant on the surface to the lowest working level, and the air will be disseminated through the stoping areas and finally upcasted through the ventilation shaft,”
http://www.miningweekly.com/print-version/fridge-shaft-project-complete-for-worlds-largest-shaft-sinking-contract-2011-11-23

[Lonely Knight]

ну я хотел сказать "ствол охлаждения или охлаждающий ствол", конечно, по аналогии с вентиляционным