Ventilation guide


Back to guide start
  • 1.
    Types of ventilation
  • 2.
  • 3.
    Ducts and kitchen flue
  • 4.
    Access doors
  • 5.
    Air Valves
  • 6.
    Fresh air makes a difference

Types of ventilation

Natural ventilation

The simplest system is natural ventilation. This is used for basic applications, although is not recommended for complete ventilation in houses. Here the temperature difference between indoors and outdoors is used to achieve natural draughts in the system. A bathroom fan is also recommended for forcing the ventilation during the warm summer months.

Transport of waste heat

With todayʼs high heating costs, many home owners are choosing to install a fireplace or a heating stove. Using our ducts and components, combined with a fan, you can easily distribute the excess heat from your stove to other rooms, thereby achieving an even, comfortable temperature throughout the house.

Mechanical exhaust

The supply air is brought in through airing windows or through valves in the outside wall. The exhaust air is extracted via the exhaust air device using a fan. The exhaust air flow is stable and controlled, and independent of the outside temperature and wind conditions. This can also be combined with an exhaust air heat pump.

Mechanical exhaust and supply

If you want to go one step further, you can add a heat exchange unit that takes the heat from the exhaust air and transfers it to the supply air. Using this system you save energy through reduced heating elsewhere due to the preheated air.

Lindab recommends!

Details of the duct system

There are many different solutions on the market for mechanical house ventilation – heat recovery units, fans and other equipment .One thing all these have in common is a duct system that connects all the incorporated components, and this is where Lindab comes into the picture.

The Lindab Safe Click duct system comprises components where all ends are supplied with a double sealing strip of ageing-resistant EPDM rubber, which gives a very tight joint (type-approved in air tightness class D).

The system also entails very fast, easy installation. On the professional ventilation market, our spiral-fold ducts and all the required components have long been renowned for their high quality (galvanised steel plate), air-tightness and excellent fit.

Ducts and kitchen flue


You should anchor the ducts firmly at many points in order to avoid the occurrence of disruptive vibrations. You should ideally route a separate duct with an access door from the drying cabinet/tumble dryer to the outside to avoid getting textile flocks in the regular system.

Access doors

Access doors

Ventilation ducts shall be placed so that they are accessible for cleaning. What this means for the positioning of access doors, duct dimensions, cleaning methods, etc., is up to the municipal building committees to determine. A good rule of thumb might be to install access doors at changes in angle equal to or greater than 45°.

Air Valves

When the ducts from several rooms are linked together, it is necessary to position the valves in the various rooms so that the duct distance between them is as long as possible to reduce the risk of noise being transferred from one room to the next. Alternatively, a silencer can be used.

In bedrooms and living rooms, the valve must be placed as far from the door as possible to achieve the optimum through ventilation.

In bathrooms, the valve should be positioned, if possible, over the part of the bathtub or shower that is farthest away from the taps in order to achieve the optimum through ventilation.

If you have a sloping ceiling in a room, the valve should be positioned as high up as possible to avoid the occurrence of air pockets with no ventilation.

You can’t smell it, hear it, taste it but you can notice it!

It’s the little things in life that can make all the difference, even if you don’t even notice them straight away. Fresh air is one of the things we don’t really think about, but which is actually very significant. A healthy indoor climate is very important to the wellbeing of you and your family, and with a home ventilation system, the used, damp, poor air indoors is constantly replaced with filtered, fresh air from outdoors. 24 hours a day. Please contact one of our dealers for more information.