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Vent requirements for gas fire.



 
 
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  #1  
Old October 30th 05, 12:58 PM
[email protected]
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Posts: n/a
Default Vent requirements for gas fire.

We've just had a gas fire fitted in the living room and understand
there is a requirement for a vent. it's a victorian house which is far
from sealed and I intend to get a carbon monoxide alarm. We're most of
the way through fitting a secondary wood floor and the plan was to put
a vent into it to the underfloor cavity (we've recently made sure all
the air bricks to the cavity are clear).

So two questions:

1) Given the general draughtiness of the house do we really need the
air vent?

2) if yes, how big. The figure of 100cm3 was mentioned but our local
hardware stores don't carry stock and the minimum order requriements
mean I'd look online. However the vents i've found (on
andyplumb.co.uk) are measured, strangely, in inches. I'm presuming
that 100cm3 does not equal a vent meauring 10cmx10cm but relates to the
size of the holes.

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  #2  
Old October 30th 05, 01:08 PM
Brian Reay
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Posts: n/a
Default Vent requirements for gas fire.

wrote in message
ups.com...
We've just had a gas fire fitted in the living room and understand
there is a requirement for a vent. it's a victorian house which is far
from sealed and I intend to get a carbon monoxide alarm. We're most of
the way through fitting a secondary wood floor and the plan was to put
a vent into it to the underfloor cavity (we've recently made sure all
the air bricks to the cavity are clear).

So two questions:

1) Given the general draughtiness of the house do we really need the
air vent?


You need to allow for someone "draught proofing" it later.

2) if yes, how big. The figure of 100cm3 was mentioned but our local
hardware stores don't carry stock and the minimum order requriements
mean I'd look online.


Last time I checked (about 7 years) it was 16 sq in, which is about 100cm^2.

However the vents i've found (on
andyplumb.co.uk) are measured, strangely, in inches. I'm presuming
that 100cm3 does not equal a vent meauring 10cmx10cm but relates to the
size of the holes.


The area is the "free flow area" (ie area of holes) not the overall vent
dimension.

Don't muck around with this, do it right.

--
73
Brian, G8OSN
www.g8osn.org.uk


  #4  
Old October 30th 05, 02:36 PM
[email protected]
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Posts: n/a
Default Vent requirements for gas fire.


Brian Reay wrote:
2) if yes, how big. The figure of 100cm3 was mentioned but our local
hardware stores don't carry stock and the minimum order requriements
mean I'd look online.


Last time I checked (about 7 years) it was 16 sq in, which is about 100cm^2.

The area is the "free flow area" (ie area of holes) not the overall vent
dimension.


OK, any clues on suppliers - i've only had a quick search but it didnt
deliver me anything useful

  #5  
Old October 30th 05, 03:37 PM
Uno Hoo!
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Posts: n/a
Default Vent requirements for gas fire.


wrote in message
ups.com...
We've just had a gas fire fitted in the living room and understand
there is a requirement for a vent. it's a victorian house which is far
from sealed and I intend to get a carbon monoxide alarm. We're most of
the way through fitting a secondary wood floor and the plan was to put
a vent into it to the underfloor cavity (we've recently made sure all
the air bricks to the cavity are clear).

So two questions:

1) Given the general draughtiness of the house do we really need the
air vent?


What is the consumption of the gas fire? Not all gas fires require vents -
only those above a certain consumption level.

2) if yes, how big. The figure of 100cm3 was mentioned but our local
hardware stores don't carry stock and the minimum order requriements
mean I'd look online. However the vents i've found (on
andyplumb.co.uk) are measured, strangely, in inches. I'm presuming
that 100cm3 does not equal a vent meauring 10cmx10cm but relates to the
size of the holes.


When I had an art-deco cast iron fireplace fitted a few years ago the inset
'decorative' gas fire required a vent and the fitter installed one by
cutting a slot into the floorboards and fitting a grille. It was terrible -
the draught coming up from the vent was like a hurricane - and freezing in
winter! In fact I would say that the amount of cold air coming into the room
from the vent was greater than the warm air coming into the room from the
fire. In the end we placed a piece of carpet over the vent and just made
sure that the lounge door was open a bit when using the fire. Never had any
problems.
We recently had a completely new contemporary fire installed (Brilliance
'slab' fire) and the fitter stated that the input was border-line for having
a vent fitted. I questioned him about the need for a vent and he pointed out
that the requirement for vents was only made in recent years and prior to
that no-one fitted them! As I was installing a laminate floor I just removed
the vent grille, placed a thin piece of aluminium sheet over the slot, and
laid the laminate flooring over it. Again the fire works fine, no evidence
of fumes coming into the room, and with the lounge door left slightly ajar,
plenty of fresh air to feed the fire.
If you are going to fit a vent into the underfloor cavity then I would think
strongly about ways of preventing draughts - on windy days it will be
horrendous!

Kev


  #6  
Old October 30th 05, 06:01 PM
Grouch
external usenet poster
 
Posts: n/a
Default Vent requirements for gas fire.


wrote in message
ups.com...
We've just had a gas fire fitted in the living room and understand
there is a requirement for a vent. it's a victorian house which is far
from sealed and I intend to get a carbon monoxide alarm. We're most of
the way through fitting a secondary wood floor and the plan was to put
a vent into it to the underfloor cavity (we've recently made sure all
the air bricks to the cavity are clear).

So two questions:

1) Given the general draughtiness of the house do we really need the
air vent?

2) if yes, how big. The figure of 100cm3 was mentioned but our local
hardware stores don't carry stock and the minimum order requriements
mean I'd look online. However the vents i've found (on
andyplumb.co.uk) are measured, strangely, in inches. I'm presuming
that 100cm3 does not equal a vent meauring 10cmx10cm but relates to the
size of the holes.


Whoever installed it should have checked and advised what ventilation was
required; if they didn't I'd be very suspicious as to their qualifications
to do such a job.


  #7  
Old October 30th 05, 06:42 PM
powerstation
external usenet poster
 
Posts: n/a
Default Vent requirements for gas fire.


"Grouch" wrote in message
...

wrote in message
ups.com...
We've just had a gas fire fitted in the living room and understand
there is a requirement for a vent. it's a victorian house which is far
from sealed and I intend to get a carbon monoxide alarm. We're most of
the way through fitting a secondary wood floor and the plan was to put
a vent into it to the underfloor cavity (we've recently made sure all
the air bricks to the cavity are clear).

So two questions:

1) Given the general draughtiness of the house do we really need the
air vent?

2) if yes, how big. The figure of 100cm3 was mentioned but our local
hardware stores don't carry stock and the minimum order requriements
mean I'd look online. However the vents i've found (on
andyplumb.co.uk) are measured, strangely, in inches. I'm presuming
that 100cm3 does not equal a vent meauring 10cmx10cm but relates to the
size of the holes.


Whoever installed it should have checked and advised what ventilation was
required; if they didn't I'd be very suspicious as to their qualifications
to do such a job.


Further to that it should not have been installed without correct
venilation.


  #8  
Old October 30th 05, 08:41 PM
Andrew
external usenet poster
 
Posts: n/a
Default Vent requirements for gas fire.

What fire did the guy install? not all fires need extra ventilation. Are
there any other appliances in the same room?


wrote in message
ups.com...
We've just had a gas fire fitted in the living room and understand
there is a requirement for a vent. it's a victorian house which is far
from sealed and I intend to get a carbon monoxide alarm. We're most of
the way through fitting a secondary wood floor and the plan was to put
a vent into it to the underfloor cavity (we've recently made sure all
the air bricks to the cavity are clear).

So two questions:

1) Given the general draughtiness of the house do we really need the
air vent?

2) if yes, how big. The figure of 100cm3 was mentioned but our local
hardware stores don't carry stock and the minimum order requriements
mean I'd look online. However the vents i've found (on
andyplumb.co.uk) are measured, strangely, in inches. I'm presuming
that 100cm3 does not equal a vent meauring 10cmx10cm but relates to the
size of the holes.



  #9  
Old October 30th 05, 10:21 PM
Brian Reay
external usenet poster
 
Posts: n/a
Default Vent requirements for gas fire.

wrote in message
oups.com...

Brian Reay wrote:
2) if yes, how big. The figure of 100cm3 was mentioned but our local
hardware stores don't carry stock and the minimum order requriements
mean I'd look online.


Last time I checked (about 7 years) it was 16 sq in, which is about
100cm^2.

The area is the "free flow area" (ie area of holes) not the overall vent
dimension.


OK, any clues on suppliers - i've only had a quick search but it didnt
deliver me anything useful


Sorry, no. Last time I looked into this was just to check a fire already
installed was OK- not actually installing one myself.

Really, I do advise you look into this very carefully. Check what the fire
needs, then make sure that the room is so supplied.

Did the person who fitted the fire not check all this?

I noticed someone commented about draughts such vents can cause. Yes, they
can cause draughts but they also stop you being killed, so don't skimp!.
You can always position the vents so that the draught isn't drawn across the
area you sit!

--
73
Brian, G8OSN
www.g8osn.org.uk


  #10  
Old October 31st 05, 12:12 PM
[email protected]
external usenet poster
 
Posts: n/a
Default Vent requirements for gas fire.


Grouch wrote:
Whoever installed it should have checked and advised what ventilation was
required; if they didn't I'd be very suspicious as to their qualifications
to do such a job.


The fitter did check, advised us 100cm3. The floorboards that were
down at the time a) had up to 4mm gaps between them, and b) had a hole
about 10cm x 10cm where a first, aborted, attempt had been made to fit
the fire by another fitter so there was more than enough ventilation.
There was no point in him insisting on a vent being added because he
knew we were about to lay a secondary floor which would change the
situation.

Hence my question:
1) in a draghty house is it still necessary (not to comply with the
regs but to be safe)
2) where can i buy a suitable vent? (and if they're measured by
external diameter rather than cubic airflow what size vent do i need?)

 




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