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what is a piv unit and how does it work - nuaire

How to Install Positive Input Ventilation Unit

Positive Input Ventilation is the most effective method of curing and preventing condensation dampness. Installed in over 1 million homes, PIV is the UK’s most popular method of low-energy, whole-home ventilation.

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How Does PIV work?

Works by gently introducing fresh, filtered air into the dwelling. Air is drawn into the unit and is passed through filters before being pushed around the home – as the air moves, it creates a pressure as it dilutes, displaces and eventually replaces the stale air in the home.

As air is constantly moving, humid air cannot settle on cold surfaces, such as windows or outer walls, meaning it cannot condensate. Eventually, this humid air is forced out of natural leakage points throughout the home – such as windows, under doors or even through keyholes. PIV has become the UK’s most popular method of low-energy, whole-home ventilation, and is now installed in over 1 million homes in the UK.

There are different types of PIV systems, which have slightly different installation methods. For example, our Drimaster-Eco unit is installed in the loft and is ducted down to a diffuser in the ceiling, whilst our Flatmaster unit requires ducting from outside the property to a central location. Despite having different installation methods, both units work in the same way and achieve the same goal – providing fresh, filtered air to a property and curing condensation.

To find out more visit our Positive input ventilation product page, click on the button below.


How to Install your Drimaster-Eco

Drimaster-Eco, Positive Input Ventilation (PIV) system from Nuaire will cure your condensation dampness problems and improve your indoor air quality (IAQ). Follow our simple video guide and install your low-energy Drimaster-Eco system quickly and successfully. Visit our YouTube channel for the full video.

YouTube channel 

Your Drimaster-Eco PIV system is designed to be mounted in the loft space where it draws fresh air through the G4 grade filters, and inputs it at ceiling level into the home. Positive Pressurisation is the most effective method of retrofit whole-home ventilation and is a tried and trusted cure for condensation dampness.

The principle introduces a constant flow of fresh, filtered air into the home, which lowers humidity levels and so prevents streaming windows and black mould patches from forming. It creates a dry, allergen-free environment that is great for asthma and allergy-sufferers. The G4 grade filters are fine enough to prevent pollen entering the home - good news for hay fever sufferers.

The Drimaster-Eco heat model (DRI-ECO-HEAT-HC) has all the controls for the fan in the ceiling diffuser, so you can commission and adjust the settings without having to enter the loft. A 400w low-energy heater tempers the air delivered into your home. Electrically-controlled, it minimises energy-use.  Drimaster-Eco features handy wireless controls and sensors which respond to changing humidity and CO2 levels, to ensure the best indoor air quality, and to help you save energy.

Frequently Asked Questions

We recommend that your PIV system be installed by a trained professional. For loft mounted units, your loft space will need to be adequately ventilated, that party walls are intact, and that any ceiling holes are sealed, and extract fans are discharging to the outside and not into the loft. Our simple video guide provides step-by-step instructions for how to install our low-energy Drimaster Eco system quickly and successfully.


Absolutely - in fact, Nuaire has an entire range of PIV units designed to ventilate homes without lofts. Nuaire’s Flatmaster system introduces air into the apartment at a continuous low rate, eliminating condensation dampness and forcing out indoor pollutants such as radon gas and carbon monoxide. Allergens are kept to a minimum, and outdoor pollutants such as pollen and traffic fumes remain outside the home. The results are a fresh and healthy indoor environment.

Nuaire’s PIV units are easily installed and designed to sit seamlessly within all property types, making very little noise and always providing the best quality air throughout your home.

Nuaire’s PIV units are guaranteed against failure due to faulty goods or workmanship, and all come with an initial 12-month product warranty as standard.

The warranty does not extend to damage caused by fair wear and tear, failure due to lack of maintenance or maltreatment, or if the installation is carried out contrary to the appropriate product instructions, to good engineering practice and to the recommendations of relevant governing bodies such as CIBSE, HVCA & FETA.

Related Information

Product range
To view the product range, visit our Positive Input Ventilation page.
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