On Thu, 26 Feb 2009 08:58:58 +0000, Arfa Daily wrote:

So what has changed ?

The industry assessment of undersized ventilation. Until about the middle
of last year anything over about half the correct ventilation was OK
(technically "Not to Current Standards") provided the appliance seemed to
be working OK. Now it's got to be spot on (less a few percent allowance
for margin of error). It's not Brutish Gas' decree but the industry
generally, in response (apparently) to an increase in Carbon Monoxide
incidents due to undersized ventilation. (I would guess this may be
connected with more people putting in uPVC windows and laminate flooring
which cut out much of the 'adventitious' ventilation one got from draughty
wooden windows and floors.)


Why all the waste of effort to change something
that has always been adequate, and was presumably specced to supply the
required air back when the house was designed and built, and architects
still knew what they were doing ?

Because it wasn't specced to supply the required air back when the house
was designed and built because the architects still didn't know what they
were doing ?



--
John Stumbles -- http://yaph.co.uk

Seagull Management
Management technique characterised by flying in, making a lot of noise,
crapping on everything, and then leaving.