Ziggur wrote:

snip

How can you tell whether the clear glass windows are the right way round?
There is a simple test that you could do by looking through the unit at a
flame held on the inside BUT my advice would be to trust the installers.
Some sceptics might be surprised to learn that they usually get it right.

(But then I am biased )

Without wishing to offend my builders, who were hell-bent - despite my
protestations - on building what they *thought* I wanted, as opposed to
that which I had planning permission for (two separate, and, quite
frankly, hugely different things), could you explain the test for me?

Regards
Paul