i've got a new gas fire and want it in the same chimney space but the flue that's in there needs to be redirected a couple of inches one way. is it ok to use a flue that isn't perfectly straight? i was thinking of buying extention flue pipe to do this.
it will be ok to use the exsting chimney as long as it has been tested for soundness by a gas corgi engineer. this would have been done using smoke pellets. but any new instalation into a chimney would be better to have a flue liner which will run from your new fire all the way up to the top of the chimney with a terminal at the end...