I am currently trying to make my fireplace opening suitable for a
Valor Anthem DFE gas fire bought from B&Q.
The exisiting fireplace was to small in every dimension to accommodate
the new fire. It is a precast single block Class 2 flue design,
installed in 1986.
I have removed the one piece starter block at the base, thinking it
would be a relatively straightforward matter of purchasing a new,
wider one, but it now appears that this is much more problematic than
Ideally I'd like to fit some new starter blocks and make good the
joint to the gatherer block at the top.
Any advice, warnings tips gratefully received!
Thanks for the reply. I might have confused things by saying it was a
DFE fire, as I understood it to be a generic description of the type.
The instructions say the fire *is* suitable for a class 2 flue.
There may still be problems. Class 2 can refer to pre-cast and pre-
fabricated flues. If your house was built in 1986 then it is possible
that it has pre-cast flue blocks with a cross section of 12,000 mm2,
which is not acceptable by modern standards. I am pretty sure that the
'class 2' that your fire refers to is the modern 'twinwall' 5 inch
diameter flue. Does your house have flat walls in the room above the
fire ?, or a chimney breast. If flat then it would seem to have pre-cast
flue blocks that are part of the inner wall leaf. This (AFIK) is not
suitable for a DFE fire.
As I say, Ed the resident registered gas installer will have more to
say, or failing that you should take advice from any corgi registered
installer or your local BCO.
Remember that DFE fires are designed to give a realistic fire effect
which means lots of carbon monoxide (AFAIK), and anyway are horridly
inefficient - typically 10Kw gas burnt and only 1 to 2 kW of heat.
If you put this in yourself (using the wrong type of flue) then sell the
house it's your neck on the legal chopping block.
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