Redoctober Posted November 20, 2018 Share Posted November 20, 2018 (edited) We have a chimney which is to service the WBS when it gets commissioned in early December. Unfortunately the builders positioned the hole for the register plate too far back in the hearth area causing the WBS to sit further back in the "hole" than we would have hoped for. I have spoken with the installers and they say there is nothing we can do to bring it forward. I suggested a double 45 degree bend flue pipe set up but he said because it is a chimney and not a twin flue system, the pipe needs to go vertically from the WBS to the aperture in the register plate. Now, once I have been signed off so to speak is this something I could fit retrospectively or is it a complete no no ? Thoughts welcome. Edited November 20, 2018 by Redoctober typo Link to comment Share on other sites More sharing options...
Cpd Posted November 20, 2018 Share Posted November 20, 2018 I am not speaking with any authority but I have seen all manner of set ups and to conclude I think WBS are very forgiving. Just the other day I set up one in a shed for an event..... just plonked it on the ground, put a flexi pipe on it and wired it up to the door frame..... total hash but it worked great. When we were finished I took of the flexi pipe and shoved the stove back under a tarp for storage. Can you fit the pipe to come out the back of the stove ? You need to be able to clean the flu from inside the house, usually they have a T at the bottom with an access hatch to put the rods up. What you don’t want is to create an area that ash can accumulate and potentially block the flue......... 1 Link to comment Share on other sites More sharing options...
joe90 Posted November 20, 2018 Share Posted November 20, 2018 Not read it all but this might help. https://www.hetas.co.uk/wp-content/mediauploads/BFCMA-General-Guidance-10-12-12.pdf we have two 45’ bends but above the fireplace behind the chimney breast and that works ok. 1 Link to comment Share on other sites More sharing options...
PeterW Posted November 20, 2018 Share Posted November 20, 2018 No reason why you can’t have a pair of 45 bends before a register plate unless the chimney also has bends in it too ...?? 1 Link to comment Share on other sites More sharing options...
ProDave Posted November 20, 2018 Share Posted November 20, 2018 There is a limit of 4 bends in total for a flue system. Can it come out of the back and then turn rather than coming out of the top? In what way is it too far back? too tight for manufacturers clearances or just aesthetics? 1 Link to comment Share on other sites More sharing options...
Redoctober Posted November 20, 2018 Author Share Posted November 20, 2018 Thanks @ProDave @PeterW @joe90 and @Cpd - Here is an image which hopefully will show how far back we have to have the WBS in order to achieve a vertical flue. The chimney is straight so no problems with bends etc with that. Link to comment Share on other sites More sharing options...
PeterW Posted November 20, 2018 Share Posted November 20, 2018 So that’s a 300mm straight into the stove, 45 degree elbow with a sweeping access, and then a 45 back up into the register plate. All within regs and perfectly reasonably assuming you keep 3 x D from that oak mantle. Just check the door and the hearth though as that may be a limiting factor. 1 Link to comment Share on other sites More sharing options...
joe90 Posted November 20, 2018 Share Posted November 20, 2018 1 hour ago, ProDave said: Can it come out of the back and then turn rather than coming out of the top? Was thinking that myself. (Great minds think alike ?) Link to comment Share on other sites More sharing options...
Gav_P Posted November 20, 2018 Share Posted November 20, 2018 What have you got on the walls within the fireplace? Is it wet plastered, board and skim, fireboard? If its its any form of plaster it will definitely crack with the heat generated by the stove. Link to comment Share on other sites More sharing options...
Redoctober Posted November 21, 2018 Author Share Posted November 21, 2018 10 hours ago, Gav_P said: What have you got on the walls within the fireplace? Is it wet plastered, board and skim, fireboard? If its its any form of plaster it will definitely crack with the heat generated by the stove. It is the appropriate type of render applied by the installation team, so I'm hopeful it won't crack! Link to comment Share on other sites More sharing options...
joe90 Posted November 21, 2018 Share Posted November 21, 2018 @Redoctober what stove is it? Link to comment Share on other sites More sharing options...
Redoctober Posted November 21, 2018 Author Share Posted November 21, 2018 53 minutes ago, joe90 said: @Redoctober what stove is it? It is a Wiking Mini 2, 5kw w/b stove. Thanks Link to comment Share on other sites More sharing options...
Cpd Posted November 21, 2018 Share Posted November 21, 2018 2 hours ago, Redoctober said: It is the appropriate type of render I used a heatproof render around my fire and it’s working fine without cracking. 1 Link to comment Share on other sites More sharing options...
PeterW Posted November 21, 2018 Share Posted November 21, 2018 I used NoMorePly as the board and then had it skimmed but its directly onto blockwork so the board is just there as a decorative finish. The stove also has a full soapstone casing yet BRegs still treat it as though its got a normal steel skin ! Link to comment Share on other sites More sharing options...
joe90 Posted November 21, 2018 Share Posted November 21, 2018 @Redoctober Just looked at the website and the flue can be top or rear, so what about rear and 90’ bend to bring it forward like you want? 1 Link to comment Share on other sites More sharing options...
Redoctober Posted November 21, 2018 Author Share Posted November 21, 2018 3 hours ago, joe90 said: @Redoctober Just looked at the website and the flue can be top or rear, so what about rear and 90’ bend to bring it forward like you want? Massive thanks @joe90 - I will certainly mention this to the installer ahead of the final set up phase. ? Link to comment Share on other sites More sharing options...
Redoctober Posted November 21, 2018 Author Share Posted November 21, 2018 An update - thanks to @joe90 I contacted the installer and he has confirmed the flue will be coming out of the stove at the rear, so this will push it forward some mm's which in turn should improve the look beyond it's current situation. I have to say, the service I have received from the installer has been well below expectations - but as we all know, we live and learn!! Link to comment Share on other sites More sharing options...
joe90 Posted November 21, 2018 Share Posted November 21, 2018 Glad to be a help, I have received soo much help here myself, I am forever grateful to so many ? Link to comment Share on other sites More sharing options...
dpmiller Posted January 21, 2023 Share Posted January 21, 2023 I'm going to drag this kicking and screaming from the past with a question. It turns out that our system chimney ends up bringing the flue into the house (through the Ignis Protect insulator) a wee bit lower than would be optimal for our chosen stove. It's at 45degrees. The regs drum on about elbows being a max of 45deg and a maximum of 4in a system, with a 90 seen as 2x 45s. So this means it's acceptable to use a 45 to bring the pipe to horizontal, and then a 90 to drop it into the stove but does this then *not* allow (say) using a 15 as soon as it leaves the wall and then a 45+15 onto the top of the stove? As the resultant 60 isn't specifically mentioned and otherwise there'd be "too many" changes of direction? That would seem preferable to me as a 60 is less restrictive than a 90, and there would always be a chance of condensate drips from a truly horizontal section Am I being stoopid? Link to comment Share on other sites More sharing options...
Temp Posted January 22, 2023 Share Posted January 22, 2023 Part J is confusing. I think section 1.48 and 1.49 applies to all flues not just solid fuel appliances. 1.48 says "Where bends are essential, they should be angled at no more than 45° to the vertical." Diagram 15 on page 27 Part J says "90 degree bends not suitable for solid fuel". So I think for a WBS you should use 2*45 degree bends to make a 90. Link to comment Share on other sites More sharing options...
Temp Posted January 22, 2023 Share Posted January 22, 2023 11 hours ago, dpmiller said: It turns out that our system chimney ends up bringing the flue into the house (through the Ignis Protect insulator) a wee bit lower than would be optimal for our chosen stove. Have you actually built the chimney already? Normally you can just raise the entry. Link to comment Share on other sites More sharing options...
dpmiller Posted January 22, 2023 Share Posted January 22, 2023 11 minutes ago, Temp said: Have you actually built the chimney already? Normally you can just raise the entry. Umm, three or four years ago... Link to comment Share on other sites More sharing options...
Temp Posted January 22, 2023 Share Posted January 22, 2023 On 20/11/2018 at 17:57, Redoctober said: Now, once I have been signed off so to speak is this something I could fit retrospectively or is it a complete no no ? We fitted ours after completion. I had quite a problem getting the right register plate to go from the stove pipe to the chimney because the company I used kept sending the wrong parts. Apart from that it wasn't too hard. 1 Link to comment Share on other sites More sharing options...
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