Stovax Brunel 2CB stove - flue size

[geraldthehamster]

I can't see a actual clearance to combustibles on installation manual, what distance do you have?

As I understand it the regulation clearance is 3x the flue diameter, from a vitreous pipe. The distance from a twin wall is going to be down to the instructions for the brand of flue (50-70mm).

 

[geraldthehamster]

But you've got blocks there, so there isn't an issue.

Isn't there the same issue with the underside of the panelling as there would be with the underside of a wooden beam? There is a clear unobstructed line (red line in my diagram) between it and the pipe, and the clearance is insufficient for a vitreous pipe

My question is why you're using wood paneling to cover it

It's a fair question. Because I like wood panelling The whole room is being panelled.

I'd drop a SS liner down the pseudo chimney, and then line it with vermiculite. Yes, you need the twin wall at the top, but no more than that.

See where you're coming from. I should have been clearer about the dimensions. The opening will be 1500mm high, then there is 700mm from the closure plate to the ceiling/flat roof. Regulations require 450mm twin wall below the combustible ceiling, which takes me to 300mm of the closure plate, so not much room to put in a liner below.

View media item 101121

 

[lostinthelight]

.

As I understand it the regulation clearance is 3x the flue diameter, from a vitreous pipe. The distance from a twin wall is going to be down to the instructions for the brand of flue (50-70mm).

I meant clearance from top of stove

 

[Doggit]

The wood paneling on the chimney is not a good idea; although you're using the twinwall to protect it, you've still got the the stove generating heat from the front, and I'm not sure how far away it's got to be, so here's as far as I can help you I'm afraid.

 

[geraldthehamster]

The wood paneling on the chimney is not a good idea; although you're using the twinwall to protect it, you've still got the the stove generating heat from the front, and I'm not sure how far away it's got to be, so here's as far as I can help you I'm afraid.

Thanks for your help, it is appreciated.

Required clearance to combustibles to the side is 300mm; I have 450mm.

Required clearance above isn't given. Rather, there is a diagram but they haven't put a number on it! I have 900mm clearance above the stove.

If you look at some of the installations on the Stovax web page I linked to at the start, some have exposed timber barely a foot above the stove. I also seem to recall a friend saying his installation wasn't compliant because his timber beam was less than a foot above the stove. So I suspect the required clearance above is 300mm.

We also tend to ignore the fact that everyone I know stacks logs by the side of the stove ... as do I with my other stove.

A quick search reveals that the minimum temperature needed to ignite wood is 180C. I don't think the air temperature is going to reach that, 900mm above a stove!

 

[Doggit]

It's possible that what looks like a wooden lintel in the photo, is actually a concrete composite one, but make sure you've got your smoke alarm and CO detector fitted, and I think you'll get away with things.

 

[geraldthehamster]

Follow up question:

Given my lack of confidence in Stovax's reply, can anyone see a problem if I do the following?

I found a system (Convesa-KC) with a 5" twin wall to 6" twin wall increasing adaptor. I propose to use 1m 5" twin wall up from the stove, for aesthetic reasons. Once above the closure plate I will go to 6" for the remainder of the 4.5m run.

 

[lostinthelight]

Follow up question:

Given my lack of confidence in Stovax's reply, can anyone see a problem if I do the following?

I found a system (Convesa-KC) with a 5" twin wall to 6" twin wall increasing adaptor. I propose to use 1m 5" twin wall up from the stove, for aesthetic reasons. Once above the closure plate I will go to 6" for the remainder of the 4.5m run.

See Post #14 which you didnt respond to?
Btw, what customer suport told you was wrong in my opinion and backed up by research I had done!
!

 

[bernardgreen]

I propose to use 1m 5" twin wall up from the stove, for aesthetic reasons. Once above the closure plate I will go to 6" for the remainder of the 4.5m run.

Will it be possible to sweep the 6" diameter pipe if access from the bottom is restricted to brushes intended for sweeping 5" pipes.

 

[geraldthehamster]

You think this will be OK in terms of draw then? My only reservation is that flow in a vehicle exhaust works on the opposite principle - going from larger to smaller. I'm interested in whether anyone has any understanding of the physics.

On the rest of your previous post, yes, I do understand the requirements.

 

[geraldthehamster]

Will it be possible to sweep the 6" diameter pipe if access from the bottom is restricted to brushes intended for sweeping 5" pipes.

That's a good question, and I'm not certain what people do about sweeping when taking a twin walled flue off the stove, with no inspection door.

 

[lostinthelight]

135° 6” twinwall “T” box for flue access.
litl

 

[geraldthehamster]

135° 6” twinwall “T” box for flue access.
litl

Unfortunately the flue will go straight up through a flat roof in a single story room

 

[lostinthelight]

Unfortunately the flue will go straight up through a flat roof in a single story room

it can be internal or external if room and access allow?
litl

 

[geraldthehamster]

it can be internal or external if room and access allow?
litl

Difficult. 900 from stove to closure plate, 750 from closure plate to ceiling (within breast).

How do chimney sweeps do this? Do they have equipment to get into the flue from within the stove? Hmm.