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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Ventilating shafts. 7 letters:

AIRWELL: Ventilating shaft
UPTAKES: Ventilating shafts.
AIRWELLS: Ventilation shafts
DUCT: Ventilation shaft
UPTAKE: Ventilating shaft
UPCAST: Ventilating shaft in a mine
AIRWAY: Ventilation shaft