On Mon, 12 Nov 2012 17:56:29 +0000, Big Les Wade
wrote:

posted
On Mon, 12 Nov 2012 14:51:20 +0000, Big Les Wade
wrote:

Also the existing chimney (into which the flue pipe will be inserted) is
quite narrow. The builder thinks it will only take a 5in pipe.

Then it will not comply with part J unless burning smokeless fuel,
even the exempt devices under the clean air act only allow for coal
and not wood.


The October 2010 edition of part J (on p.30, Table 2 "Size of flues in
chimneys") says a 125 mm flue is acceptable for closed appliances which
meet the requirements of the Clean Air Act when burning bituminous coal
or wood. I assume this means DEFRA approved stoves?

That's good, my 2002 version only allows for bitumous coal. I've
downloaded the 2010 edition and you are right, a 125mm flue is allowed
for a woodstove up to 20kW if it meets the requirements of the clean
air act.

AJH