Mike A wrote:

Have spent some time with google groups trying to find a definitive answer
but still not sure...

I need to install a liner into an old stone chimney but have had

conflicting

advice on what's required. It's for a decorative flame effect gas fire,
house is stone built around 1920. The chimney looks to be about 12-14"
diameter, when doing a smoke test smoke appeared in one of the upstairs
rooms through the open fireplace, hence my need for a flexible liner.

Some say a standard 7" liner will be fine, others indicate 6" or 7" twin
wall liner is required. Doing on the job on a tight budget, but safety is

of

course important. The instructions mention a 7" flue liner should be used
but don't mention twin wall, although a diagram of a Class 1 chimney is
shown. The appliance is described as 'For decorative effect only'
manufactured to current issue of EN 509.


Anybody able to comment please?


Yes.

If the chimney is pre 1970 I thik, you are allowed to put in a single
wall flexible flue liner. Post that you need double walled. Never sure
why, but its a fact.

There are various grades depending on the expected flue temperatures. I
had to use stainles insulated dowble walled for a wood burning stove.
VERY expensive. About 600-700 I think for an upstairs room. Fitting it
involved dropping it down from the pot and then fixing to a new pot
afterwards.

Howver, nce its in ytourt fire safety aspects are fiully covered.


TIA
Mike