I'm a scout leader and we've just had a maintenance visit from the gas
company. We have an Open Flue Boiler (?) + another gas appliance in
our kitchen - we've been told that the ventilation is inadequate and
needs improving. Apparently it needs to be 575cm sq (ish) due to
legislation changes during last year. They will provide advice but
it'll cost and its not cheap, he did say that we could use air bricks
but they wouldn't be any good because they don't let suffient air
through so we'd need dozens of them for it to be adequate.

Any help regarding type of grills, size of hole etc. would be really
appreciated as we are currently unable to run the boiler until its
sorted.

Thanks in advance

Jacko

On 9 Jan, 17:08, Jacko wrote:
I'm a scout leader and we've just had a maintenance visit from the gas
company. We have an Open Flue Boiler (?) + another gas appliance in
our kitchen - we've been told that the ventilation is inadequate and
needs improving. Apparently it needs to be 575cm sq (ish) due to
legislation changes during last year. *They will provide advice but
it'll cost and its not cheap, he did say that we could use air bricks
but they wouldn't be any good because they don't let suffient air
through so we'd need dozens of them for it to be adequate.

Any help regarding type of grills, size of hole etc. would be really
appreciated as we are currently unable to run the boiler until its
sorted.

Thanks in advance

Jacko

Look up a ventilator supply specialist (IIRC Fans and Grilles used to
have a place in Leeds).
Contact them and ask for a price for a weatherproof vent with the spec
you have been given. Larger is ok.
It is not permitted to have a fine mesh in the vent as they clog with
dust but if the suppler is advised it is for a combustion vent they
will supply a suitable unit, possibly with a large (bird and vermin
proof) mesh incorporated. Go for metal not plastic as vandals have
less effect.

On 10 Jan, 19:52, cynic wrote:
On 9 Jan, 17:08, Jacko wrote:





I'm a scout leader and we've just had a maintenance visit from the gas
company. We have an Open Flue Boiler (?) + another gas appliance in
our kitchen - we've been told that the ventilation is inadequate and
needs improving. Apparently it needs to be 575cm sq (ish) due to
legislation changes during last year. *They will provide advice but
it'll cost and its not cheap, he did say that we could use air bricks
but they wouldn't be any good because they don't let suffient air
through so we'd need dozens of them for it to be adequate.

Any help regarding type of grills, size of hole etc. would be really
appreciated as we are currently unable to run the boiler until its
sorted.

Thanks in advance

Jacko

Look up a ventilator supply specialist (IIRC Fans and Grilles used to
have a place in Leeds).
Contact them and ask for a price for a weatherproof vent with the spec
you have been given. Larger is ok.
It is not permitted to have a fine mesh in the vent as they clog with
dust but if the suppler is advised it is for a combustion vent they
will supply a suitable unit, possibly with a large (bird and vermin
proof) mesh incorporated. Go for metal not plastic as vandals have
less effect.- Hide quoted text -

- Show quoted text -

Just had a look and you might like to try the following link

http://www.fansandspares.co.uk/shop/...users--louvres

"Jacko" wrote in message
...
I'm a scout leader and we've just had a maintenance visit from the gas
company. We have an Open Flue Boiler (?) + another gas appliance in
our kitchen - we've been told that the ventilation is inadequate and
needs improving. Apparently it needs to be 575cm sq (ish) due to
legislation changes during last year. They will provide advice but
it'll cost and its not cheap, he did say that we could use air bricks
but they wouldn't be any good because they don't let suffient air
through so we'd need dozens of them for it to be adequate.

Any help regarding type of grills, size of hole etc. would be really
appreciated as we are currently unable to run the boiler until its
sorted.

Thanks in advance

Jacko


575 sq cm is quite a big hole. If you live in a 3-4 bed house, I would
suggest that you get a 2nd opinion and ask how nuch is needed for each of
the two applainces.

--
Michael Chare

On Fri, 9 Jan 2009 09:08:36 -0800 (PST), Jacko wrote:

Apparently it needs to be 575cm sq (ish)

A hole over 1/2 a meter each side? Seems a bit OTT to me. How big is this
boiler again 2MW?

575sq cm is 57,500sq mm or 240mm per side of an open hole. You need to
look for one or more things ventilators that total more than 57500sq mm
"free air ventilation". The packaging should have this info on as detailed
in another post.

--
Cheers
Dave.

On Fri, 09 Jan 2009 19:38:20 +0000, Owain wrote:

A quick check on Screwfix suggests that item 14434 size 140x140mm has a
free air space of 14,700mm²

You'll need 4 of those... 14700 x 4 = 588cm sq.

--
Cheers
Dave.

On Fri, 09 Jan 2009 19:38:20 +0000, Owain wrote:

Jacko wrote:
I'm a scout leader and we've just had a maintenance visit from the gas
company. We have an Open Flue Boiler (?) + another gas appliance in our
kitchen - we've been told that the ventilation is inadequate and needs
improving. Apparently it needs to be 575cm sq (ish) due to legislation
changes during last year. They will provide advice but it'll cost and
its not cheap, he did say that we could use air bricks but they
wouldn't be any good because they don't let suffient air through so
we'd need dozens of them for it to be adequate. Any help regarding type
of grills, size of hole etc. would be really appreciated as we are
currently unable to run the boiler until its sorted.

IANEdSirrett :-)

B&Q, Wickes et al all sell 'gas safety vents' which have the sq
centimetrage of vent written on the packaging. Buy sufficient to total
575sq cm and fit them.

A quick check on Screwfix suggests that item 14434 size 140x140mm has a
free air space of 14,700mm²

They must be stated as suitable for gas ventilator use.


I posted a reply to this on Sat but it must have gone missing.

The ultimate info is BS 5440-2.

I'd want to know a lot more about the setu, appliances, makes, types and
models. To know if the require ventilation is good.

If you truly need that amount of ventilation then 4 big vents are needed
as everyone has said.




--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html