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Ventilation

Frequently Asked Questions:

Is a chimney compatible with ventilation?

In the presence of mechanical exhaust ventilation, an automatic device should cut the ventilation off as soon as the chimney is used, in order to avoid any backdraft from the chimney.

In the presence of natural ventilation, there is no risk of the smoke being pushed back being reversed from the chimney to the inside of the dwelling: since the chimney is operating, its stack effect is much greater than the natural stack effect of the ventilation ducts.  Please refer and comply with the regulation in force.

Is an exhaust hood in the kitchen compatible with ventilation?

According to the kind of hood, the possibilities vary:

  • Recycling hoods and double-flow hoods: can be used with natural ventilation and centralised mechanical exhaust ventilation
  • Passive hoods connected to the air duct: only in centralised mechanical exhaust ventilation

Please refer and comply with the regulation in force.

In case of a gas appliance in the kitchen, what steps should I take in order to be compatible with the adopted ventilation?

Depending on the type of gas appliance, the steps to be taken vary. When the gas appliance located in the kitchen has an airtight circuit (autonomous), that means it takes the combustion air directly on the outside and then extracts the burnt gases directly to the outside without going through the ventilation ducts, no air inlet is usually necessary in the kitchen. On the other hand, when the gas appliance uses the air which enters the kitchen as a combustion agent, a direct or indirect air duct is then usually necessary. To select the proper air duct dimensions, please refer to applicable regulations.  Please refer and comply with the regulation in force.

Can I install air inlet in the kitchen?

Generally, NO. When no gas appliance requires a direct air duct in the kitchen, it is necessary to install an exhaust unit on the ventilation duct without installing an air inlet in order not to ” short-circuit ” the air inlets of the main rooms. Nevertheless, certain regulations require the presence of an air inlet directly in the kitchen.  Please refer and comply with the regulation in force.

Can I install air inlet in the bathroom?

Generally NO. These inlets would ” short-circuit ” the air inlets of the main rooms – rooms which would then be under-ventilated – and would discharge odours and humidity produced by the bathroom towards the other rooms. As the air inlets introduce the new air, the one introduced in the bathroom would decrease the amount of fresh air in the other rooms.

Condensations appear on the bathroom walls: how can I get rid of this?

Contrary to what is commonly believed, the problem does not necessary result from the lack of an exhaust unit surface in the bathroom (in natural ventilation, but perhaps from a lack of air inlets in the habitable rooms. In fact, as only the air which is taken in can be extracted, an inadequate air inlet or flow inside the dwelling, aggravated by the presence of obstacles such as doors with no undercut, may cause under-ventilation in the wet rooms.

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