Retrotec Equipment for Domestic vs Commercial Air Tightness Testing

Air tightness testing is used across both residential and commercial buildings, but the equipment needed can vary significantly depending on the size and complexity of the property.

At Thermal Image UK, we use Retrotec blower door test equipment every day and supply their full range to customers throughout the UK. From individual homes to large commercial buildings, choosing the right setup is essential for accurate, efficient air leakage testing.

What is Retrotec blower door equipment used for?

Retrotec equipment is designed to measure uncontrolled air leakages through a building envelope.

A calibrated blower door fan is installed within an external doorway and used to pressurise or depressurise the building. Airflow and pressure measurements can then be used to calculate the building’s air leakage or air permeability.

The basic principle is the same for domestic and commercial buildings, but the fan capacity and number of fans required can differ considerably.

Retrotec equipment for domestic air tightness testing

For smaller residential properties, compact blower door systems can provide the airflow range required for accurate testing.

Retrotec 300 Series fans are particularly suited to smaller and very airtight properties, including Passivhaus projects. These buildings may have extremely low leakage levels, making sensitive airflow measurement important.

For larger homes or more typical residential projects, higher-capacity equipment may be more appropriate depending on the building volume and expected leakage.

Commercial buildings often need greater fan capacity

Commercial air tightness testing can involve much larger internal volumes.

Offices, schools, warehouses, retail units and other commercial properties may therefore require significantly greater airflow to create the pressure differential needed for testing.
We supply Retrotec 5000 Series fans for many residential and commercial applications, while the more powerful 6000 Series is designed for larger testing requirements. Very large or complex buildings may need several fans positioned around the property and operated together.

Which Retrotec equipment should you choose?

The right Retrotec blower door test equipment depends on factors such as building size, expected airtightness, construction type and the type of test being carried out.

It is important not to assume that a more powerful fan is automatically better. Equipment should provide an appropriate airflow range for the property being tested, while calibrated instruments are essential for reliable measurements.

At Thermal Image UK, our experience covers everything from single houses and Passivhaus developments to large, complex commercial buildings. We use the full range of Retrotec blower door fans ourselves, which means our recommendations are based on practical testing experience rather than product specifications alone.

Retrotec equipment and support from Thermal Image UK

Whether you carry out domestic or commercial air tightness testing or both, having the right equipment can make testing more efficient and dependable.

We supply Retrotec equipment across the UK and can help you select a suitable system for your testing requirements. We can also arrange calibration and repairs, providing ongoing support once your equipment is in use.