Ventilation calculator - How many DUKA One units do you need?

Not sure how many DUKA One devices you should install in your home?
With our ventilation calculator, you can quickly find the right number - whether you want a precise dimensioning or a guideline recommendation.

Proper ventilation is essential for a healthy and comfortable indoor climate. Too few units can result in insufficient air change, while too many can be unnecessary. That's why we've made it easy for you to choose the calculation method that suits your needs.

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Choose the calculator that fits your project

We offer two different ways to calculate your ventilation needs:

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Recommended quantity calculator (indicative estimate)

This calculator is for you who:

• Want a quick and easy assessment

• Renovate or retrofit insulation

• Improves the indoor climate in existing homes

Here is a recommendation based on room size and typical ventilation needs in Danish homes.

Perfect for detached houses, apartments, basements, offices, bedrooms and living spaces where comfort and indoor climate improvement are key.

Br18 quantity calculator

This calculator is for you who:

• Must comply with BR18 requirements for new builds

• Want a calculation based on current ventilation standard

• Want a precise result based on technical requirements

Here, the number of DUKA One units is calculated based on the requirement for an air change of 0.5 times per hour according to Danish building regulations.

Suitable for new builds, extensions and projects with specific requirements.

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Why is proper ventilation important?

Adequate air exchange is of great importance:

• Moisture and condensation

• Prevention of mould

• CO₂ level

• Sleep quality

• Overall comfort

Modern homes are more airtight than before, especially after energy renovation. This means that natural ventilation is reduced - and this is where decentralised ventilation with heat recovery like DUKA One can be an effective solution.

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DUKA One - Efficient ventilation with heat recovery

The DUKA One ensures continuous air exchange without unnecessary heat loss. The units recover heat from the extracted air and contribute to:

• Lower energy consumption

• Stable indoor climate

• Less moisture

• Increased comfort

Multiple units can be connected and work in synchronisation to provide balanced ventilation without negative pressure in the home.

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Are you ready to calculate your needs?

Choose the solution that fits your project:

→ Want a quick recommendation? Select “find recommended DUKA One quantity”.

→ Do you need to fulfil BR18 requirements? Select “find BR18 DUKA One quantity”.

Whatever you choose, we'll help you find the right number of DUKA One devices for your home.