Cmv or controlled mechanical ventilation
Installing a dual-flow cmv in your home for a healthier home and energy savings
The principle of cmv
The cmv or controlled mechanical ventilation allows the renewal of the interior air of the house to ensure its quality.
Why ventilate your home?
Quite simply because the indoor air is often more polluted than the air outside the house because of the activities that can be done indoors as well as by the fittings (paint, glues…).
Poor ventilation can develop moulds due to the accumulation of humidity, give off bad odours and participate in the development of mites and microbes.
How does cmv work in your home? How does cmv work?
How does it work?
Air extractors are placed in each service room described in the regulatory table (see: Vmc, the principle).
Natural combustion appliances (chimney, stove, boiler, …) must have their own air supply.
The air inlets are provided by the ventilation of openings (windows) and must be sufficient to ensure a homogeneous air renewal.
Unnatural ventilation is very difficult to control, it generates significant temperature differences and thus increases the energy losses of the building.
The cmv extracts a quantity of indoor air whose flow is controlled in order to provide a controlled quantity of outdoor air for better energy performance.
Mise and oeuvre
It is imperative to call upon a professional for the installation of a cmv.
Installing a cmv in your home
Indeed, the respect of the manufacturers’ instructions which refer to the technical notices is essential.
It is important to know that the responsibility for the operation of the cmv lies with the installer of the extraction unit.
It is generally installed in the attic and must be suspended or held by elastic suspenders to avoid the acoustic discomfort caused by vibrations.
The exhaust must exit through the roof under a rain cap.
The arrangement of the extraction outlets are regulated and must respect certain distances from the floor or other appliances (cooking type, etc…).
Finally, the electrical connection must comply with standard nf c15-100: The power supply must be independent and permanent with its own circuit breaker.
How to choose your cmv
There are two types of single-flow cmv: Self-flow and hygroreglable and double-flow cmv.
The single-flow self-adjustable cmv: The cmv will adapt the flow of renewed air according to the pressure difference in the house.
The single-flow hygroreglable cmv: The air flow rate is a function of the indoor humidity level.
There are two types of humidity sensitive cmv: The hygro type a and the hygro type b.
The hygro type a combines air inlets according to the humidity rate and self-adjusting air inlets while the hygro type b only works according to the humidity rate.
The advantage of the hygro a is the reduction of the losses and thus an improvement of the energy performance.
Double-flow cmv: The cmv will recover heat from the extracted air to warm the outside air injected into the house. Heat losses due to ventilation are therefore very limited.
A significant saving in heating costs is achieved
Since 70 to 90% of the energy contained in the extracted and recovered air.
The consumption of the external groups: Always in the optics to decrease as well as possible the energy consumption of the dwelling it is preferable to privilege the external groups of low consumption.
How much does it cost to install a cmv in my home?
What is the cost?
The cost of installing a cmv varies depending on the system chosen.
When installed on a new construction, the cost is approximately :
400 € for a simple self-adjusting cmv.
700 € for a humidity sensitive single flow cmv
2 000€ for a double flow vmc.
In renovation, it is necessary to multiply by 1.5 to 2 times the prices mentioned below.
An investment that quickly pays for itself with the energy savings it allows.
The installation of a double-flow cmv with heat recovery in a 100m²house with natural ventilation in the nord pas de calais region of france allows for heating savings of up to 310€ per year.
The impact of a cmv on the environment
By installing a double-flow cmv with heat recovery, you will make significant energy savings of around 15% of your heating consumption.
The savings are all the more important since it is as much energy not consumed, therefore our product.
The environmental impact is immediate and the co2 emissions are greatly reduced;
Up to 5 kg co2 eq/m².an on our example of a double flow cmv installed in the nord pas de calais.
Using the calories present in the extracted air is to contribute to the protection of our environment.
Renewable energies are inexhaustible and
Contributes to the good health of our earth.