Wall air vent - anti-draught baffle?
Richard Russell
necessary because of the open gas fire - allow through a blast of cold
air in windy weather. I vaguely remember hearing about some kind of
baffle, fitted within the cavity wall, which allows the air through
but prevents draughts. However I can't locate anything like this.
Did I imagine it?
Richard.
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John
"Richard Russell" <ne...@rtrussell.co.uk> wrote in message
news:6b02bcd8-7605-45ef...@p25g2000hsf.googlegroups.com...
I can't imagine what could allow ventilation (the flow of air) yet prevent
draughts (a flow of air - but not desirable). The best idea might be to duct
the vent to nearer the fire so it isn't drawing the air across the floor and
making your feet cold.
Richard Russell
> I can't imagine what could allow ventilation (the flow of air) yet prevent
> draughts (a flow of air - but not desirable).
Isn't 'ventilation' related to the volume of air, but 'draughts'
related (primarily) to the velocity of air?
David in Normandy
> On 22 Mar, 14:04, "John" <john.plant90nos...@ntlworld.com> wrote:
> > I can't imagine what could allow ventilation (the flow of air) yet prevent
> > draughts (a flow of air - but not desirable).
>
> Isn't 'ventilation' related to the volume of air, but 'draughts'
> related (primarily) to the velocity of air?
>
>
Interesting. I've got the same problem with a vent which
allows fresh air into a downstairs room which otherwise
suffers from damp problems. However in windy weather it
doesn't half blow through. It's noisy too. Perhaps some
glass fibre insulation stuffed between the inner and outer
vent would stop the wind blowing through but still allow an
adequate air flow? Or would it just get soggy and block the
air completely?
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John
"Richard Russell" <ne...@rtrussell.co.uk> wrote in message
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Are the vents diametrically opposite? Could equivalent sized vents be
installed nearer to the fire to reduce the effect of the draught? Have you
got a solid floor - or is it a wooden one with space under it?
Richard Russell
> Are the vents diametrically opposite?
The vents are either side of the fireplace.
> Could equivalent sized vents be installed nearer to the fire
They're about as near to the fire as they can reasonably be, given the
width of the fireplace and the external chimney stack.
> Have you got a solid floor - or is it a wooden one with space under it?
Solid, with underfloor heating.
At present a pair of loudspeakers are placed immediately in front of
the vents (with a largish gap), which do help reduce draughts but do
nothing for the dreadful howling noise!
Dave Liquorice
> I can't imagine what could allow ventilation (the flow of air) yet
> prevent draughts (a flow of air - but not desirable).
You make the path longer and bendier, thus slowing down the (forced)
draught but still allowing the (unforced) ventilation. With ventilation
for a fire one has to do this without reducing the effective cross
sectional area of the ventilation...
--
Cheers
Dave.
Richard Russell
wrote:
> You make the path longer and bendier, thus slowing down the (forced)
> draught but still allowing the (unforced) ventilation. With ventilation
> for a fire one has to do this without reducing the effective cross
> sectional area of the ventilation...
How do you measure that area? Is it the full area of the two 9" x 9"
vents (about 0.1 sq.m. total) or something less because of the
'attenuation' of the inside grilles and the outside louvres? It would
be possible, surely, to construct some kind of internal 'labyrinth'
which would create the "longer and bendier" path without reducing the
cross-sectional area below that of the holes in the grille.
Mogga
<Davidin...@yahoo.fr> wrote:
>Richard Russell says...
>> On 22 Mar, 14:04, "John" <john.plant90nos...@ntlworld.com> wrote:
>> > I can't imagine what could allow ventilation (the flow of air) yet prevent
>> > draughts (a flow of air - but not desirable).
>>
>> Isn't 'ventilation' related to the volume of air, but 'draughts'
>> related (primarily) to the velocity of air?
>>
>>
>
>Interesting. I've got the same problem with a vent which
>allows fresh air into a downstairs room which otherwise
>suffers from damp problems. However in windy weather it
>doesn't half blow through. It's noisy too. Perhaps some
>glass fibre insulation stuffed between the inner and outer
>vent would stop the wind blowing through but still allow an
>adequate air flow? Or would it just get soggy and block the
>air completely?
Or it might just blow glass fibre threads into the room.
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Richard Russell
> It would be possible, surely, to construct some kind of internal
> 'labyrinth' which would create the "longer and bendier" path
Evidently I'm not the first to have the idea: