On 23/05/2021 09:36, jon wrote:
On Sun, 23 May 2021 08:34:22 +0100, Brian Gaff \(Sofa\) wrote:

Surely that would be rather dangerous to have around the place?
Frostbite and co 2 release in a confined area?


Brian

It's ok if you have a risk assessment and a hard hat.


Easy enough to do the sums. Breweries are potentially more dangerous
places, my mate brought a Victorian one back to life and after a couple
of decades the new factory inspector suggested he needed CO2 alarms. One
of the rooms can reach a concentration that you can "taste" if you open
a sliding door on the ground floor at certain stages in the process, but
everyone there knows the fireman's rule for CO2 extinguishers. If you
can taste it, get out. That space is a "special case", the door provides
access to the "drain" from which casks are filled, it is only open at
that stage and and with the door open the pooled gas rapidly flows out.
For the rest of the building, a calc for max generation and very
conservative assumptions about air changes showed there was no problem.
The factory inspector accepted it without a quibble.