Single flow ventilation

Single flow ventilation for your home

Single-flow controlled mechanical ventilation (VMC) is a ventilation system that renews the air inside a home. There are mainly two types of single-flow VMC:

Self-adjusting single flow VMC

This type of VMC operates continuously and at a constant flow rate, regardless of external conditions (temperature, humidity, wind, etc.).

The disadvantage of this system is that it can lead to unnecessary over-ventilation and therefore loss of energy, especially in winter.

Hygro-adjustable single flow VMC

This system is more advanced and allows the air flow to be modulated according to the humidity present in the home. Thus, ventilation is greater in humid rooms (bathroom, kitchen) and weaker in dry rooms.

This allows energy savings compared to a self-adjusting system.

It should be noted that these two types of single-flow VMC operate on the same principle:

1. Fresh air enters through air inlets generally located at the windows of the main rooms (living room, bedrooms), and
2. Stale air is extracted through extraction vents located in damp rooms (kitchen, bathroom, WC).

Frequently asked questions about single-flow controlled mechanical ventilation

How does a single flow ventilation system work?

A single-flow controlled mechanical ventilation (VMC) system works by sucking stale air from humid rooms such as the kitchen, bathroom or toilet, and discharging it outside. Fresh air then naturally enters the home through air inlets located in the main rooms such as the living room or bedrooms.

What is the energy consumption of a single-flow ventilation system?

The energy consumption of a single flow VMC depends on several factors, including its power and its operating time. On average, it is estimated that a single flow VMC consumes between 25 and 100 watts. This can represent a significant portion of a home's energy consumption, hence the importance of choosing an energy-efficient model.

What budget should you plan for purchasing a single-flow ventilation system?

The cost of a single flow VMC can vary depending on the model and its characteristics. For a self-adjusting single flow VMC, count between 100 and 200 euros. For a single flow humidity-controlled VMC, the price can range from 200 to 500 euros. These prices do not include installation, which can also vary depending on the complexity of the task.

How to estimate heat losses linked to a single flow VMC?

Heat losses linked to a single flow VMC are mainly due to the extraction of hot air from the home. To estimate them, it is necessary to take into account the extracted air flow, the temperature difference between the inside and the outside, and the efficiency of the VMC. There are online calculation tools that can help you make this estimate.

How do I determine the appropriate size for my single-flow VMC?

The sizing of a simple VMC flux depends on the size and volume of your home, as well as your ventilation needs. As a general rule, an air flow of at least 20 m3/h per person is recommended. For a home of 100 m2 with 5 occupants, for example, you would therefore need a VMC capable of extracting at least 100 m3/h.

What type of single flow VMC is recommended for a volume of 200m3?

For a volume of 200m3, a single flow humidity-controlled VMC would be a good option. This type of VMC adjusts the air flow according to humidity, which optimizes air quality while saving energy. However, the choice will also depend on your budget and your preferences in terms of comfort and energy saving.