Prometheus wrote in
:

snip
Also, FWIW, I ran a less powerful forge for a short time that was
*not* efficient (no forced air mixing with the gas), and it set off
the CO detector several times- there was no odor associated with that
that I could detect, but it may have been because I was immersed in it
from the time it started up, and was just used to it.


CO is odorless. That's another reason you need a detector for it.

Patriarch