VMC: the pros and cons, advantages and disadvantages

Heating, insulation, ventilation, VMC, cooling ... short thermal comfort. Insulation, wood energy, heat pumps but also electricity, gas or oil, VMC ... Help in choosing and implementation, problem solving, optimization, tips and tricks ...
dedeleco
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by dedeleco » 13/10/11, 21:15

when you come back from work, there is a smell of smoke in the living room. I imagine that the chimney flue (open hearth, even if the shutter hatch) creates a call for air to compensate for the relative tightness of the rest of the room. Simple assumption. One day, I will put a small wood stove to improve the thing but we are not there yet ...

is a serious indication of the risk of asphyxiation by CO, one day of bad luck more than the other days !!!

Stove or open hearth or insert requires a nice supply of air for combustion, otherwise risk of death by CO on a day of bad luck !!!
The inert "chimney pipe (open hearth, even if the shutter flap)" does not create a call for air, but it is the VMC which requires air, creating a vacuum which sucks in the air by the chimney, which then works in reverse and which brings back the smells of soot from the chimney, even when extinguished. The even imperfect shut-off hatch allows this inverted chimney air to pass through, given the airtightness of the room !!! (it is the pleasure of double glazing).

If you make fires in this fireplace, a special air supply for the fireplace is imperative (whatever its nature: open, stove or insert), (typical standard 300cm2 which is above all a question of survival to avoid dying killed by CO and therefore to be respected !!! )
Your CMV and the tightness of the house imperatively have a special air supply for the fireplace (closed if off, never forgetting to open it for fires !! ), if not sooner or later, death by CO insured at home !!!! and much faster than a Fukushima-Chernobyl in France, sooner or later inevitable too !!!!
Also buy a CO detector !!!

I specify that I lived this problem in addition with my architect of 10 years ago, air intake too small, (I had nevertheless insisted!) Who was also condemned for this error (among other wet varieties ) and the expert specified 300cm2 and this without VMC and non-waterproof parts !!!!

So for your life, I insist, ensure a combustion air supply in all cases, VMC, double glazing and open hearth, not open, insert, stove !!!
Rather rare stoves have planned a special air supply essential for watertight houses with double glazing and VMC !!
See examples on econology !!
It's about your life, with CO you die in a few minutes and with toxic mold spores, you die in a few years !!

One day, I will put a small wood stove to improve the thing but we are not there yet ...

is a very dangerous misconception that can kill by CO, except stove or waterproof insert with special supply of outside combustion air.
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dhaulagiri
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by dhaulagiri » 13/10/11, 21:58

Starting from a problem of mortises, now I risk death, asphyxiated by a wood stove that I have not yet installed ... Thank you anyway for these tips: to reassure you, know that the fireplace is equipped with an air supply coming from the crawl space. It is closed for now because I am not using the fireplace and will not use it until I have installed the stove.

I take this opportunity to give you complete reason:
dedeleco wrote:The inert "chimney pipe (open hearth, even if the shutter flap)" does not create a call for air, but it is the VMC which requires air, creating a vacuum which sucks in the air by the chimney, which then works in reverse and which brings back the smells of soot from the chimney, even when extinguished. The even imperfect shut-off hatch allows this inverted chimney air to pass through, given the airtightness of the room !!! (it is the pleasure of double glazing).


That's what I meant, but my words expressed the opposite. Say like that, it's better ...
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aerialcastor
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by aerialcastor » 13/10/11, 22:02

Just a quick note to say that insulation, airtightness, and water vapor tightness should not be confused.

In a few words. a material can be airtight but not waterproof, as is the case with most technical clothing (gore tex). It lets perspiration pass but it cuts the wind.
Many materials are airtight but not water vapor: brick, cellular concrete, plaster, lime, vapor barriers, ... on the other hand cement so the concrete blocks are vapor tight. water.
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bamboo
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by bamboo » 14/10/11, 14:32

Clearly, it is difficult to compare 2 dwellings.
The "natural" humidity level is very different from one region to another.
When you have dry air outside, it is easier to have air that is not too humid inside.
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dedeleco
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by dedeleco » 14/10/11, 14:53

The Paris region is wetter than the Gard, because in principle less sun. So the cause of the difference is probably not in the climate.
Having both, in the Paris region and in the Var, I know the difference !!!
There are probably hidden causes to understand from clues, like the wet errors of my architect in the Var !!.
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bamboo
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by bamboo » 14/10/11, 15:27

Humidity is not only a function of the sun:
Rennes (18 ° C) and Nice (21 ° C) are 64% of humidity every 2 today.
Strasbourg (14 ° C) has a humidity of 48%
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dhaulagiri
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by dhaulagiri » 14/10/11, 15:40

I confirm: it is mainly a question of circulation of air masses. A question of continentality, say our geography teachers ...
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dedeleco
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by dedeleco » 14/10/11, 15:42

It is mainly a function of the distance to the sea in good weather and the time of day !!
At night around 3am, close to the sea, 100% and even in Strasbourg often !!
Between 48 and 64% it is small variation compared to that between day and night, linked to the strong variation of T which makes going up to 100% easily !!!
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by roy1361 » 14/10/11, 21:53

dedeleco wrote:It is mainly a function of the distance to the sea in good weather and the time of day !!


Because at your place the distance from the sea changes according to the good weather and the time of day ???

Well at my place, we only have lakes, but they stay where they are, and this whatever the time of day or the weather ...

In fact, like that, they are easier to find ...

;-)
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dhaulagiri
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by dhaulagiri » 14/10/11, 23:55

: Lol: : Lol:
I was pinched for not answering ...

It may be because, when it is bad and when it is dark, you do not perceive the distance at all :?:

The proof: if I get up at night without lighting, I sometimes come across a wall.

I was not tired of having a complex boiler, now the sizing of my VMC needs the forecast models from Météo France! Come on, I'm going to pump a little to clear my head

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