How Does a PIV Unit Work? Positive Input Ventilation

How Does a PIV Unit Work? Positive Input Ventilation

How Does a PIV Unit Work? Positive Input Ventilation

Every home should have fresh air, it should be free from mould and the causes of it, one way to give your home the best chance at being the best it can be, is through the use of a PIV system.

In this blog, we will answer the question ‘How does a PIV unit work?’

To prevent mould, fresh air should constantly be introduced into your dwelling daily, as it helps to regulate temperature and reduce condensation. Introducing fresh air can be as simple as having a ventilation routine, or installing extractors or PIV systems. Almost all of this is facilitated by ducting.

I-Sells is here to provide the answers you need whilst also supplying you with all the information you need to combat mould and have a well-ventilated home.

What is a PIV unit?

Positive Input Ventilation (PIV) ventilation systems are the most effective method of curing and preventing condensation dampness. Invented by Nuaire and installed in thousands of dwellings each year, PIV can be a more cost-effective and simple to install ventilation solution, whilst still meeting building regulations.

Is a PIV unit the same as an extractor?

No, A PIV unit is similar to an extractor, in the fact that they both extract indoor air. However, PIV systems replace that air with fresh air from outdoors at a continuous rate. The result is a home that always has fresh air, and is free from stale air and condensation.

How does a PIV unit work? Positive Input ventilation

How does a PIV unit work? Positive Input ventilation

The unit is mounted in the loft space of the building it is installed in, it extracts the air in the dwelling whilst simultaneously extracted air from outside. The outside air is then passed through the filters and inputting it, at ceiling level, into the property.

An integrated heater tempers airflow should the temperature in the loft space drop below a set point, ensuring ultimate comfort in the home.

The result of this airflow is a reduction in condensation and humidity, a key factor in preventing the cultivation of mould.

The benefits of a PIV system

At I-Sells, one of the PIV units we provide is from the established creator Nuaire, and their product, the Drimaster.

Here are some benefits of a Drimaster:

  • Cures condensation dampness – PIV reduces the humidity in the air, curing condensation dampness preventing mould growth
  • Improved indoor air quality and healthy living environment- Indoor pollutants from cooking and cleaning, as well as outdoor pollutants including pollen and Radon gas, are eradicated from the home
  • A Unique cost-effective solution
  • Meets Regulations – Meets Part F & L of Building Regulations as a low-energy ventilation strategy
  • Easy & simple installation – Typically installed in under one hour
  • Modern, sleek circular diffuser – Provides occupant acceptability
  • System controls located in the ceiling diffuser for easy commission and access for maintenance checks
  • Filter change indicator – To ensure optimum performance is maintained
  • Low maintenance – Filter clean or replacement every five years
  • Energy efficient – System goes into standby during warmer months when there is no evidence of condensation
  • Clinically proven to help allergy and asthma sufferers
  • 7-year warranty: 1-year parts and labour, remaining 6 years parts only

What if I can’t get a PIV unit?

What if I can’t get a PIV unit?

We are sensitive to the fact that all of our readers may not be able to get a PIV system just yet, so is there an alternative way to get the benefits of a PIV system? You’ll be happy to know there is. It’s as simple as opening your windows.

Opening your windows in your home so there is a passage of air travelling from one side of the house to the other (Upstairs too if your home has multiple levels) will allow any humid, stale air to leave your home, and be replaced with fresh air from outside.

Practicing this method on a daily basis is a basic ventilation routine, that being said, PIV systems do all this without the risk of making the home too cold, whereas doing this method with the windows will result in your home getting colder in a quicker fashion.

Where can I buy PIV units?

I-Sells is an established and trusted supplier for all things ventilation related, whether that be PIV units, extractor units, ducting, and much more! Here is a small selection of our PIV unit range.

Nuaire Drimaster Eco Hall Control Diffuser Positive Input Ventilation Unit

The Nuaire Drimaster Eco Hall Control Diffuser Positive Input Ventilation Unit has the added benefit of having the system controls located in the contemporary ceiling diffuser. This unique feature bestows the homeowner with complete control of the unit, without having to enter the loft space.

Not only can settings be altered with the push of a button on the contemporary diffuser, but there is also a 7 segment display which notifies the user of the need for filter change and what setting the Drimaster is running on.

The DRIMASTER-ECO range provides whole home ventilation using the Positive Input Ventilation principle, which introduces fresh filtered air into the dwelling at a continuous rate, encouraging movement of air from inside to outside. Click here to view on our site.

Drimaster Eco Heat Positive Input Ventilation Unit With Integral 400W Heater By Nuaire

The Drimaster Eco Heat Positive Input Ventilation Unit incorporates all of the functions of our DRI-ECO-LINK-HC unit but with the benefit of an integral heating element, located between the flexible duct and ceiling diffuser.

This heating component will temper the air which is distributed through the property via the ceiling diffuser, thus ensuring a comfortable living environment. This pioneering design sees the low watt heater (400w) react efficiently and effectively, guaranteeing an economically friendly product.

A temperature sensor on the outside of the unit monitors and controls the heater output to maintain the set point. The set point ranges from 5° to 15° and can be adjusted from the ceiling diffuser. If the temperature at the heater outlet is above the set point, the heater will not activate. To browse more details, click here

Nuaire Drimaster Eco 3S Loft Control 3 Storey Property Positive Input Ventilation Unit

The Nuaire Drimaster Eco 3S Loft Control 3 Storey Property Positive Input Ventilation Unit is the only unit within the DRIMASTER-ECO range which is suitable for install within three-storey properties, by using an intumescent aluminium diffuser in order to meet fire regulation standards.

The unit itself works by drawing fresh air in from the loft space and dispersing it through the property via a powder-coated ceiling diffuser, which provides a 1-hour fire-block. This technology is fundamental to the well-being of the homeowner and allows Nuaire to offer a ventilation solution for every property type. Click here to browse.

We also have the option of having a heated version of this Drimaster, click here to view

Running costs between 5p and 10p per day dependent on the electrical supplier and heating and speed setting.

Order your PIV unit today

Order your PIV unit today

We at I-Sells endeavour to ensure our customers have all the information they need before investing in our mould solutions. Be sure to visit our blog page to learn about the vast array of factors and issues surrounding ventilation, mould, condensation, and much more.

We hope to have answered the question “How does a PIV unit work?’’

We understand you may have more questions, Do not hesitate to contact us for more information about whatever you need our help with. If you’d like to send us an email, click here. For other contact options, see below:

Call us on 020 8463 9696

Visit us at our showroom:


Monday – Friday: 8:00 am to 5:30 pm

Saturday: 9:00 am to 12:00 pm

Sunday: Closed

15 St John’s Parade

Sidcup, Kent

DA14 6ES

United Kingdom

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