| Answer | Crossword Clue |
|---|---|
| FLUE | Air shaft |
| INTAKE | Mine's air shaft |
| WELL | Shaft for air or light. |
| COALMIEN | Air in a sooty shaft? |
| well | vertical shaft for air, stairs, or an elevator |
| upcasts | A shaft through which air leaves a mine |
| wells | vertical shaft for air, stairs, or an elevator |
| downcast | a shaft down which air passes, as into a mine |
| upcast | shaft or passage up which air passes, as from a mine |
