Hi,
An earlier post on this subject did not seem to illicit an answer, but I wonder if anyone has any experience in the UK of fitting fireplace doors. These are glass doors which fit in your open fireplace. The frame has adjustable air vents. The idea is that they reduce or even prevent as much warm air going up the chimney. heat still eminates from the fire as radiated heat.
I found one place in the UK but the price seemed very high (i.e =A3500) for a set for a 460mm(w) x 540mm (h) pseudo-Rumford fireplace.
Anyone build their own perhaps. Clearly glass must be high temperature proof