Extractor hood, natural ventilation

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 ...
moby25
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Extractor hood, natural ventilation




by moby25 » 26/01/11, 15:29

Bonjour à tous

I installed my extractor hood in place of the old mode in recycling.

For the moment I do not have a non-return valve and air escapes therefore by the conduit of 120 mm in diameter.

I had planned to put a permanent 50m3 / h extractor in this so-called kitchen. (170m3 fast speed)

I now ask myself the question of using this hood as a natural ventilation system.

I know it is not standard and not authorized as a ventilation system, but what do you think?

This could save me the purchase and installation of an extractor ...
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dedeleco
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by dedeleco » 26/01/11, 16:48

Have you calculated in KWh the thermal losses of the aeration according to the standards and the one you have ???
We come to wonder about the interest of double glazed windows ??
except double flow VMC.

Do you have a working fireplace, insert or stove that requires a special air supply when they are working?

Otherwise, for me, no need to ventilate, only if problems of clear and clear condensation, enough depending on the number of baths per day !!

Permanent ventilation is unnecessary, in my opinion, unless necessary and clear as overcrowding or bathing suit 3 to 5 times a day !!!!
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moby25
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by moby25 » 26/01/11, 22:15

In this case, double glazing can be considered useless in 3/4 of the houses with vmc, because the gain obtained by the double glazing is canceled by the vmc.

I don't quite understand the reasoning ...
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dedeleco
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by dedeleco » 26/01/11, 23:14

The exact losses with the flow must be calculated in KWh, but if these losses are comparable to what the double glazing saves, then the question arises of the placebo effect of double glazing !!
I don't know about 3/4 of the houses, but considering the direct sellers calling my home, listening to them, I could have changed my windows 100 times !!

However, we can not ventilate at all or little, or put a VMC double flow !!

In any case, the more a house is poorly insulated, the less interesting the double glazing, and the more, before, it is necessary to insulate elsewhere on the essentials, like outside.
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moby25
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by moby25 » 26/01/11, 23:37

Ventilation is also used to extract stale air from VOCs, formaldehydes, etc.

With a poorly insulated (but "airtight") house, or with a very well insulated and airtight house, it is therefore necessary to renew the air to a minimum.

To return to the problem:

In the case of a house with single glazing (but again waterproof, it is a theoretical approach) with vmc and in the case of a house with double glazing and perfectly waterproof also with vmc, there will be everything even less heat loss in the latter.

Well that's my point of view.
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dedeleco
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by dedeleco » 27/01/11, 01:36

Very theoretical case, because with simple glazing the old windows are not perfectly tight and renew the air a little slowly, which is sufficient as ventilation.
The best is the double flow ventilation and avoid junk in agglo and other, insecticides, treated wood, in his house.
Double glazing only makes sense after better insulation of the house, outside.
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moby25
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by moby25 » 27/01/11, 11:02

I agree, but few jobs are profitable in the short term.

Take the example of exterior insulation, since we are talking about it.

The costs are very high. I do not think that an external insulation is profitable in 5 years on an already insulated house.
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dedeleco
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by dedeleco » 27/01/11, 14:56

Except do it yourself with straw, boron and lime !!!!!

It is only hours of work of rare specialists !!!
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