Hi,

I have opened up our fireplace which had a flame effect gas fire. I'll
get it swept and inspected next week. Irrespective of whether it needs
a liner, I'm struggling with how all the pieces fit together. I plan
to install an old cast iron wood burning stove with 100mm diameter
flue outlet in the back. It came with a locking collar that fits in.

From here I think it will look like this, from stove working back I
think we have

stove -collar -length of flue pipe(horizontal) - right angle bend -
length of flue pipe (vertical) -Register plate - pipe pretrudes
through plate (?) - Possibly liner

Now my stove will sit on the existing hearth and while it's free
standing i.e in the room, I would want it pushed back into the
fireplace as close as possible .

My question is how do you fit all this together ? None of this stuff
is flexible as far as I can see. Do you have the make/break point at
the stove end collar, in which case how is that joint secured. Is it
like guttering where there is a certain amount of give in each joint
so you can bend and twist it ? I'd assumed not as these joints have to
prevent smoke escaping.

I guess the best analogy I can think of is a fitted gas oven , where
you have some flexible hose of the gas, you can make the joint, then
slide the whole thing back. I'm trying to imagine how this doesn't all
fall apart in a fairly inaccessible placeinaccessible place