Flue brick dimensions Circa 1970 ???

[spadders]

Hi guys,
I really hope somebody can help,
We're thinking of removing our gas fire and installing a wood burner, however, our flue is made from hollow concrete blocks, which if memory serves are the same size externally as a breeze block.
I need to know the internal dimensions of these type of blocks to see if I can have a liner made with sufficient csa to be safely used, but having spent hours online, I can't seem to find any info on these older flue liners, other than a picture of some that were sold at auction.

View media item 71385
I don't want to rip the fire out if it's a complete no go, but hoping somebody may be able to help.

Many thanks in advance guys[/img][/url]

 

[saladdays]

Try this website for the answer: http://thegreenlivingforum.net/forum/viewforum.php?f=21

 

[Blagard]

<Snipped>
I need to know the internal dimensions of these type of blocks to see if I can have a liner made with sufficient csa to be safely used,

I don't want to rip the fire out if it's a complete no go.

I am pretty sure it is simply a no go from the start. Essentially the problem is not so much the csa. The minimum dimensions simply cannot be achieved. Having a narrow slot of a flue may be OK for gas but not for wood burners.

http://www.hetas.co.uk/wp-content/mediauploads/BFCMA-General-Guidance-10-12-12.pdf See page five

The other problem is the flue is class 2 and the insulation required from combustable materials is greater for a class 1 flue

 

[spadders]

Hi Blagard, thanks for the reply.
Yes, it looks as though it's a non starter.
The only other option is going straight up next to the wall and boxing in, but may just scrap the whole idea.