Quote franco
Chimpac
Thank you for swallowing your pride and showing yourself wrong.
As your pictures prove, expedition do indeed use "expedition" tents (semi geodesic design exactly the type I recommended...) and as a "mess" tent at altitude can use a pyramid tent ( just for the record, the Black Diamond Megalite is a pyramid tent, not a tarp and not a shaped tarp either... ), however there is no chimney to be seen and are not considered safe enough to be used to sleep under by organised expeditions in those areas (individuals may choose to use one).quote
Quote chimpac
My daughter and her husband are climbing Aconcagua in Argentina this week. I have not converted my son in law to use a chimney yet but the group they are climbing with are using a separate cook tent with a chimney. Quote

I say, A different cook tent was used when they were at lower levels, I saw a chimney coming out of their tent.

Quote climbers
A more modest kitchen for the higher camps.
The higher the team gets the more pared down the operation becomes. The winds have been light enough (about 10-15 mph in camp this afternoon) that the team is likely still able to use a small cook tent at camp 2. Once they move to high camp it is likely that the guide will be making all of the food and water for the group in the vestibule of their sleeping tents. Quote

I say, You said sleep under a chimney, I assume that means with a hot stove. I have not, nor do I know of anyone who would sleep with a backpack size stove burning wood or gas. I suspect you know very little about my stove/chimney that you are judging. As far as chimney safety goes my stove jack is metal and I can touch it with my bare hand when a hot fire is burning in the stove. Fire or sparks do not come from my chimney and I do not use a damper or a spark arrestor.

I only mentioned a cook tent, I never said anything about the type of other tents used by climbers.