Origin of air shaft
Examples from the Web for air shaft
Mr Trotman went down the air-shaft communicating with the other boilers.Man on the Ocean|R.M. Ballantyne
Then there was a man across the air-shaft who practised on the clarinet, and a professional singer up-stairs.Dwellers in Arcady|Albert Bigelow Paine
Inside the big cylinder was a second smaller one, like an air-shaft, five feet in diameter.
From the granitoid square at the base of the air-shaft came the rattle of after-dinner dishes and the babble of dialect.Just Around the Corner|Fannie Hurst
You remember that I told you there was an air-shaft in the middle of the caisson?