My question is whether it's necessary to reduce the size of the opening again for the installation of a gas fire and fire surround. The surround will actually hide the fact that the hole is large and offset so is it required for fixing purposes? The height of the existing opening had been reduced by resting a row of bricks on top of two old iron gas pipes which had been let in to the bricks on each side!
We are intending to buy one of those B&Q jobs where you can mix and match the surround, back piece and fire itself.
Do these sorts of fires fix to the surround itself or require support from the surrounding wall ? The sizes of the fires seem to be between 470mm and 520 mm which happens to work about right if I add a row of bricks to reduce the hole size.
I'll post a picture if it's difficult to envisage from the description above.
Can you get manuals for these types of fires online so that I can check the requirements before I purchase ?
PS. I'm aware of the testing required of the chimney itself and removal of the old metal flue used for the back boiler.