Multi-unit interior air well name

[Mike Lamb]

What do you call these air wells in the middle of buildings which have no access other than windows? I'm pretty sure I asked this before but cannot remember the answer.

[Marc]

I've known it to be called 'light well'.

[Bill Kibbel]

Light well is the recent term.  When the Tenement House Act was enacted - all windows had to open to plain air - it was called an air shaft  (where all the tenants dumped trash and emptied chamber pots).

[Jim Katen]

Anyone else find an unusual number of knives at the bottom of these air shafts? 

[mjr6550]

I was going to say trash disposal well.

[RK52]

Stink well