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if you are with bg just ring them up raise a complaint with them and get the vent size confirmed- the size for a 552 is 90cm2 from mi's

and as a side note- an open flue boiler takes the fumes away up the chimney not into the room, it takes combustion air from the room only which is why its important to have a correctly sized vent
 
well having read through this entire thread and commenting as a qualified gas engineer with years of experience
what valve can break on a open flued boiler and emit fumes into the room?
this sounds implausible
secondly this vent sizing debacle should have been sorted long ago and if i was in rented accommodation and i had been issued 3 AR reports gas safe would have been involved long ago,however i deal with tenants on a daily basis there are two sides to every story
thirdly this site is not the place for arguments if there is any doubt in a appliance being safe and contradicting comments have been issued by both independent GSR engineers and BG ring gas safe,but a warning to the letting agent/landlord you will be prosecuted under GUISR IF PROBLEMS ARE FOUND AT THE PROPERTY,and so will the gsr who issued the cp12 so i would advise you get your facts very clear before going down this route
 
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Been off for a while and after coming back on and reading this......wow
I am however of the opinion of what valve can break?
im interested to find that out?
 
Ive also just read through this thread and can't actually believe all this hassle has been caused by what im guessing is a slightly undersized vent. The reg's on the classification of vent sizes have recently changed, but IMO the system has obviously been like this for many years with no problems and is only being raised now because of the changes in regs. This job to make it bigger would take no time at all wither chop it out so you can fit a 100 cm2 vent cover and sleeve or re core and install a vent into that 30 mins if that through most bricks. £150 seems a bit excessive.

Also dont see what valve can break to cause a co leak, even if there is poor flame picture due to lack of ventilation ( which i highly doubt ) the flue should be doing its job and this is the most important safety aspect.

Seems like a hell of alot of stress for a 30min job tbh and any1 can do it, get the landlord round with his hammer and chisel - job done.
 
Thanks Jefaz, we did turn it off to start with but we've had no choice but to put it back on because of the weather. BG man did issue an 'at risk' notice but didn't turn it off and we didn't sign disclaimer.
having read this thread i cant decide if were dealing with the tennant or landlord from hell but the quote above did make me wonder about the logic behind the decision to turn it on when you seem convinced it is dangerous given a choice of being cold or dieing id reach for a sweat shirt every time
 
Its kind of besides the point now guys. We've moved. Please try not to discourage other people from seeking help in the future by questioning their motives, neither the landlord or we as tenants wanted to be in this situation, both parties felt they were right and couldn't understand why the other couldn't see that. The facts in this case are we wanted the vent to be resized because we were told it was too small, the landlord felt it was unnecessary as it was safe when they had been living there. Both parties believed they were right. The situation changed when we had a Carbon monoxide leak. Since we moved I believe the landlord has taken advice from another engineer the result of which I can't tell you as I said we are no longer living there.
What matters is the situation will be resolved either way before another tenant moves in.

Please don't make light of this situation, there was no need to try and determine who was the bad guy. This thread was created so that I could get some advice from the professionals, I'm happy to say many of you very kind people have been great and offered some brilliant advice. Thank you, and in the nicest possible way I hope we don't have to speak again in the near future. Naomi xx
 
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