HOLE in the wall gas fire

[aston1965]

i am new to the forum and hopeing the experience will be of some help, i am to remove the old gas fire and to fit a hole in the wall gas fire, what is the procedure , is there a restriction on how high up the wall it can go and how wide i can have it, will it need a shelf to sit on ,i;m aware it needs to have a lintel above fire buts thats about all i know please help .