sm_jamieson wrote:
Difficult to say, but AFAIK the French make their
doors just like ours. Perhaps you could e-mail or
write to the manufacturer? Babelfish translations
might be useful if you don't speak the language.


Oh Chris. I know, I know.
But EVERYONE calls them french doors,

Then they must be educated (or exterminated)!


The manufacturer is unknown - there were on a new-build house.

They may be questioned, it depends on the insulation of the
rest of the place, AFAIK - couldn't your local pen-pusher
be consulted? Slim chance of a sensible answer, I know...