REGULATION VMC

WHAT DO YOU NEED TO KNOW ABOUT THE REGULATION OF THE VMC?

Aiming to optimize the comfort of the occupants and to reduce the energy consumption by alternatives more respectful of the environment, the regulation VMC applies as well to the new constructions as to the houses in renovation. Constantly revised and improved, it is now in its sixth version.

What does this regulation apply to? What are the associated obligations? What does it allow? Overview.

APPLICATION OF THE VMC REGULATION

The CMV regulation is a standard defining the rules and recommendations for the design, installation and upgrading of all controlled mechanical ventilation systems
CMV
.

The VMC regulation is issued by the Grenelle de l’Environnement, a competent body in the construction and updating of the thermal regulation. Indeed, the VMC regulation is an integral part of the thermal regulation which also covers the standards on insulation, heating and lighting.

VENTILATION, HEATING, INSULATION: THE 3 INSEPARABLES

Three inseparable links, ventilation, heating and insulation must always go together. They aim respectively at

  • improve air quality,
  • reduce energy consumption,
  • increase thermal comfort.

In this respect, the coupling of the
Double flow ventilation with a wood stove
is a real winning combination in the context of the RT 2012 regulation

VENTILATION, AN ESSENTIAL LINK

Since the thermal regulation has tightened the rules to reinforce the insulation in new constructions, the tightness of the building envelope has allowed to reduce the heating consumption.

This airtightness prevents air renewal. This is where ventilation comes in, and it is very important for
guaranteeing air quality
in a building with reinforced insulation.

In this regard, what are the changes to be aware of regarding the VMC regulations? What standard applies today for a new HVAC installation?

VENTILATION OF DWELLINGS: THE INITIAL OBLIGATION

Thermal regulations have evolved over time. There were different stages before the implementation of the RT 2020 regulation. As a reminder, the decree of October 22, 1955 and the order of November 14, 1958 require the installation of a ventilation system per room.

In order to meet this requirement, the building must have one window or ventilation grille per room. In 1969, a new decree set a new condition: to install a permanent mechanized ventilation in the multi-family housing and
individual
.

THE 1982 DECREE SETS THE MINIMUM EXTRACTION RATE

The decree of March 24, 1982 introduces a new standard so that the ventilations can effectively renew the stale air in the dwelling. Existing ventilation must meet a minimum exhaust rate. This minimum flow rate refers to the exhaust air flow rate excluding activation of a heat pump .

It is set at :

  • A flow rate of 35m3/h for a T1 apartment
  • A flow rate of 135 m3/h for a T7 dwelling.

VENTILATION QUALITY: A CONCERN

This 1982 regulation also requires permanent ventilation that covers the entire building with air inlets and outlets installed in each room. Today, with the increase of volatile organic compounds (VOC) and the reinforcement of insulation, this minimum extraction flow rate no longer allows to properly clean the air.

THE RT 2012 REGULATION

The
regulation VMC RT 2012
revises the conventions by making mandatory the installation of a CMV with a certain level of performance for all new buildings. This VMC regulation requires a reinforced thermal insulation accompanied by a treatment of the thermal bridges. The
regulation VMC RT 2012
applies to all homes that have submitted a building permit since January 1, 2013.

REDUCE ENERGY CONSUMPTION AND HEAT LOSS

The RT 2012 VMCregulation isparticularly interested in reducing energy consumption. To meet this expectation, homeowners choose between installing :

  • a single flow humidity sensitive CMV
  • and a double flow VMC model.

However, even if the humidity sensitive single flow CMV is able to regulate the airflow and to limit the thermal losses,
it is less efficient than a double flow CMV
.

RT 2012 : HUMIDITY SENSITIVE SINGLE FLOW OR DOUBLE FLOW ?

Even if the RT 2012 CMV (official text to download here) does not indicate an obligation to turn to a
Single flow humidity sensitive CMV or double flow CMV
This second option is much more efficient.

Indeed, the double flow CMV :

  • purifies the air,
  • limits thermal losses
  • and offers a substantial energy input to optimize heating.
  • Moreover, with its double flow heat exchanger, it blows fresh air at room temperature.

Coupled with a
thermodynamic air/air heat pump
this VMC provides all the heating and air conditioning needs.

TO WHAT TYPE OF BUILDING DOES THE RT 2020 REGULATION APPLY?

The RT 2020 thermal regulation came into force at the beginning of 2021. This new mandatory CMV standard applies only to
certain types of buildings.

Indeed, it frames all new constructions and aims to erect :
● positive energy buildings (BEPOS)
● and passive houses.
While BEPOS produce more energy than they consume, passive houses consume little energy and can even recycle the energy consumed.

HOW TO MEET THE CURRENT THERMAL REGULATIONS?

The regulation VMC RT 2012 is still effective for buildings for which the building permit was submitted on January 1, 2013.
For the rest, it is the RT 2020 regulation that takes over. The compulsory RT 2020 VMC regulation therefore concerns BEPOS and passive houses. The following are the compliance requirements:
For passive houses: intelligent management of consumption and the use of renewable energy by installing photovoltaic panels, for example.

For BEPOS homes: heating consumption < 12kWhep/m2, ability to produce energy for heating, DHW, cooling, lighting and other utilities.
The 2020 thermal regulations encourage the use of free energy sources to meet domestic needs. On this point, the installation of a mechanical ventilation with thermodynamic double flow makes it possible to restore heat and freshness and thus to save in heating and air-conditioning.

THE MYDATEC THERMODYNAMIC DOUBLE FLOW VENTILATION SYSTEM AND THE REGULATIONS

By the order of July 10, 2013, the Ministry of Ecology, Sustainable Development and Energy, as well as the Ministry of Equality of Territories and Housing has awarded MyDATEC the title V for the compliance of its
Thermodynamic double flow ventilation with the RT 2012 standard.

This mainly concerns:

  • The models Smart V double flow CMV Smart 200V, Smart 300V having respectively a nominal ventilation flow with heat pump of 200m3/h and 300m3/h.
  • The models Smart H double flow CMV Smart 200V, Smart 300V having respectively a nominal airflow with heat pump of 200m3/h and 300m3/h.

THE MYDATEC AIR HANDLING UNIT TO RT2012 STANDARDS

By this ministerial order, the central ventilation units are recognized for their ability to ensure the following functions

  • Air renewal
  • Fresh air filtration
  • Thermodynamic energy recovery from extracted air
  • The cooling of the air blown in by thermodynamic system

Their setting options facilitating energy management are particularly appreciated:

  • The bi-flow shutter or Bizone regulation which rationalizes the distribution of heat through two room thermostats “day” and “night
  • Free cooling, which optimizes the cooling of rooms in summer.

THE MYDATEC AIR HANDLING UNIT AND THE RT2020 STANDARD

While the RT2012 regulation imposes a maximum energy expenditure threshold of 50 kWh/m2/year, the RT 2020 requires that the building’s energy production be higher than its consumption. By installing a thermodynamic ventilation system, you can easily achieve this goal.
Recover cooling and heating energy to reduce your heating consumption, that’s what MyDATEC promises you with its MyDATEC thermodynamic double flow ventilation systems. In addition, the possibility of
remote control
of the VMC and PAC Air/Air allows an intelligent management of the consumption, which will improve your energy label.
In this sense, the MyDatec CMVs are better alternatives for your passive and BEPOS houses to adopt a positive energy, in particular by reducing your annual consumption to 12kWhep/m2/year, and thus meet the compliance requirements with the RT 2020 CMV.