| AIRWAYS | Designated flight paths; radio channels; passages for ventilation in a mine; or, respiratory tracts (7) |
| SHAFT | Access tunnel near a drift in a mine; or, a passageway for a lift (5) |
| NARROWS | Constricted channels, passages or straits of water (7) |
| DUCTS | Channels, passages (5) |
| UPPER | Word before "echelon" or "respiratory" |
| AIRERS | Means of ventilation in clapped-out Sierra (6) |
| GRILLE | It affords ventilation in restaurant, say |
| EYRE | Sound ventilation in the Australian lake |
| SYST | Circulatory or respiratory: abbr. |
| SYSTEM | Circulatory or respiratory |
| MOUSE | Long-tailed rodent known collectively as a mischief; old word for a match for firing a cannon or blasting a mine; or, a weight used when replacing a sash cord (5) |
| HEADING | Title of a chapter, page or paragraph; horizontal passage or drift into a mine; or, a curtain top (7) |
| PIT | A cherry-stone; or, a mine or other sizable hole in the ground from which stone is quarried (3) |
| ADIT | Almost horizontal passa e driven into a mine or access or drainage (4) |
| LOUVRES | Parallel slats in a door or window, used for ventilation (7) |
| BREATHER | Vent for ventilation or depressurising, as in the crankcase of an internal-combustion engine (8) |
| REEF | Gold- or quartz-bearing vein in the earth; the non-diamondiferous rock of a diamond mine; or, a ridge of coral (4) |
| HERETOFORE | Before this time, listener's to tune into a couple of BBC radio channels (10) |
| AIRING | I put in a call for ventilation (6) |
| FAN | An apparatus giving a current of air for ventilation / enthusiast |
