Frequently asked questions
Some questions frequently asked:
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 extract grille surface in the bathroom (in passive stack 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.
Can I install air inlets in the bathroom?
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 are introducing the air, the fresh air introduced in the bathroom corresponds to the air which will not enter through the bedrooms.
Can I install air inlets in the kitchen?
Generally, NO. When no gas appliance requires a direct air duct in the kitchen, it is necessary to install an extract 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. Supporting the compliance of the regulation.
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. Supporting the compliance of the regulation. 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.
Is an exhaust hood in the kitchen compatible with ventilation?
According to the kind of hood, the possibilities are different :
- Recycling hoods and double-flow hoods : can be used with passive stack and centralised mechanical ventilation
- Passive hoods connected to the duct : only in centralised mechanical ventilation
Is a chimney compatible with ventilation?
In the presence of passive stack ventilation, there is no risk of the smoke being pushed back being reversed from the chimney to the inside of the dwelling, since when the chimney is operating, its stack effect is much greater than the natural stack effect of the ventilation ducts.
In the presence of centralised mechanical 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.