On Monday, 14 December 2020 at 12:32:18 UTC, David WE Roberts (Google) wrote:

Following various bits of the discussion, it now occurs to me that there
might be a case for using a BBQ in an open fireplace, as it probably is no
worse than the embers of a coal or wood fire.

Not necessarily, as a very small BBQ may not generate enough heat to get a good draught
up the chimney.

John