We had our chimney lined 4 years ago and despite the company's claims
that lining the chimney wouldn't effect the draw, it did. We called
the company back 3 times to correct the problem. They placed a fan at
the top of the chimney to draw the smoke out, but this didn't work.
They replaced the fan and it still didn't work. They claimed that the
draw was fine but it wasn't. We had another company come and run a
video through the liner to be sure there were no problems along the
way, and it was completely clean, sealed and clear.

We finally gave up and haven't used the chimney since. I would like
to remedy the situation. What might make this chimney work again? A
stronger fan? How strong? Altering the opening to the fireplace?

Any suggestions would be welcome.