I will supply all of the ingredients, at it were (burner, flue etc) but had a couple of questions and felt that an Arsenal message board was the best place to ask.

1. Rather than have the flue go up through the ceiling, the room above, the loft and then the roof, can I go out through an external wall and then up to roof height from there?

2. If so, does it require some sort of extractor fan to get the smoke flowing out horizontally rather than vertically?

3. Does the fitter need to be registered somewhere (due to CO issues)? If so, how much should I look to shell out for fitting only (remember that I will supply the parts)?