Flue terminals protruding from the wall

[Bigred]

Hi, any views would be appreciated; you will have seen (and mabe discussed before) the type of terminal I am trying to describe, I am thinking of Room Sealed Flues where the installer has extended the outside Flue pipe (and terminal) so that it protrudes beyond for example the guttering so effectively instead of terminating flush to the wall surface as most are designed to do the pipe sticks out sometimes 18" or more, I assume so that they do not have to worry about protecting the gutter etc. having read the GSIUSP it seems this is covered by;

"Flue termination positions which are not in accordance with the M.I. and /or standards" which then should be classified as NCS although this is qualified by "compliance with the dimensional requirements set by appliance manufacturers for flue termination positions should not be a gas operatives only consideration in choosing a suitable flue termination location".

As yet I have not come across one of these terminals on a gas safety and I was wondering if you would issue an NCS and advise remedial work if encoutered, views on NCS etc


thanks

 

[GrahamM]

It is all down to the MI's. Some will allow you to extend the flue to clear guttering, but in general most I see are marked NCS. As long as boiler is operating safely it really is not a big issue.

 

[aggis]

As long as the flue length does not excede the MI & cause any other problems, it's ok. Might not look nice!!

 

[Halesowen1]

As above, most manufacturers allow this to be done, but they must also be bracketed if i am not mistaken.

 

[Bigred]

Thanks Guys not had chance to log on for a bit........ Have a good Crimbo, feet up and all that..

 

[gasmarc]

its down to MI stating the obvious that it has not been altered and is safe

 

[Bigred]

Yep, just seems strange going to do gas safety on a boiler less than 12 months old and having to classify NCS, I've no doubt that the tennant / Landlord would be asking the question "if its just been installed WHY isn't it to current standards?" but I guess the answer is ask the guy who installed it.

 

[GasmanxxxR1]

Why is it NTCS?

 

[gasmarc]

Yes i make you right there , even the local councils dont do stuff correctly like installing to close to windows etc , i saw a development that had flues about a meter out unsupported

 

[GasmanxxxR1]

Glowworm for example allow you to terminate a flue 25mm below gutters and eaves.

However the condensation can build up on the gutters and eaves and if you wish to get past this you can extend the flue out past the gutters or eaves

 

[gasmarc]

I have a customer where i did an install and when it rains heavy he gets water dripping through the boiler and onto his work top , Viessmann sent a new flue but I am stuffed if I am doing it as it is a ladder job

 

[GrahamM]

Why is it NTCS?

If the MI's state the flue should protrude a distance 'x' (vokera compact springs to mind) from the wall and this has not been adhered to then has not been fitted to standard.
There is a functional reason as well as cosmetic for fitting the flue properly:
The convection zone is stronger close to the wall and the flue should be fitted properly to ease dispersal of expelled gasses.