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What is Positive Input Ventilation (PIV)?

Positive input ventilation is a cost-effective cure for Condensation – but what exactly is PIV, and how does it work?

Positive Input Ventilation 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.

How Does Positive Input Ventilation Work?

Positive input ventilation systems work by drawing fresh air into the building from outside and then filtering it before passing it through the building’s ventilation system. This process helps to reduce pollutants such as dust, pollen, smoke, and other airborne particles that can negatively affect the health of occupants. The filtered air is then circulated throughout the building via ductwork or grilles located in various rooms. This ensures that all areas have access to healthy air at all times.

Are Positive Input Ventilation Units Noisy?

The good news for those who are concerned about noise levels is that positive input ventilation systems are actually quite quiet. Newer models use DC fans, which are much quieter than traditional AC fans used in other types of ventilation systems. In fact, most people won’t even notice when the system is running—the only sound you may hear is a gentle hum from the fan motor.

Will PIV help with damp?

Damp can cause a variety of problems in homes, such as mold, mildew, and even structural damage. Fortunately, there are ways to tackle damp and one of the most effective solutions is Positive Input Ventilation (PIV). This type of ventilation system is designed to help reduce condensation and combat dampness by removing excess moisture from your home.

One of the major advantages of using PIV to fight damp is that it helps you maintain an optimal level of humidity within your home at all times. This means that any excess moisture will be removed before it has a chance to form into damp patches or cause other damage. Another benefit of using PIV systems for damp control is that they are energy efficient.

Since these systems draw in fresh air from outside rather than recirculating existing air inside the home, they use much less energy than other types of ventilation systems such as extractor fans or dehumidifiers.

PIV Unit Best Sellers

Nuaire Drimaster ECO LC

350.00 Inc Vat
The NUAIRE DRIMASTER ECO LC is our basic unit which provides all of the benefits of Positive Input Ventilation, offering system controls on the unit within the loft space.
  • The most basic Drimaster ECO version for homes with lofts
  • Controllable only via loft. Supplied with all ancillaries required for suspension
  • Whole House Condensation Control
  • Modern Circular Diffuser
  • 5 Year Warranty

Nuaire Drimaster ECO HC

390.00 Inc Vat
The NUAIRE DRIMASTER ECO HC enhances Nuaire PIV technology with 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.
  • Basic Hall Control Unit
  • For homes with lofts
  • Whole House Condensation Control
  • Modern Circular Diffuser
  • 7 Year Warranty

Nuaire Drimaster Eco Heat HCS

510.00 Inc Vat
The Nuaire DRI-ECO-HEAT-HCS provides whole home ventilation using the Positive Input Ventilation principle. Essentially the concept is to introduce fresh, filtered air into the dwelling at a continuous rate, encouraging movement of air from inside to outside. To achieve this, the unit is mounted in the loft space, drawing air 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. Please note this unit cannot be linked to external sensors as it does not have RF capability.

Nuaire Drimaster Eco Heat HC

605.00 Inc Vat
This new modern low- energy Drimaster ECO Heat HC ventilation system has a unique 400W heating element to temper the airflow during colder periods. The unit can be controlled via the Unique 4 way switch that will boost the system and turn the Heater on/off as and when required (sold separately).
  • Heater version- Supplies tempered & filtered air to the property
  • For homes with lofts - Whole House Condensation Control
  • Supplied with all ancillaries required for a suspension installation
  • Integral 400w Heater and Modern Circular Diffuser
  • Warranty: Complete with a FULL 7 Year Nuaire Warranty
  • Low operating costs
  • Cure condensation & mould
  • Improves air quality in home
  • Very easy to install
  • Low maintenance

Nuaire Drimaster Eco HC Link

425.00 Inc Vat
A loft mounted positive input ventilation unit which incorporates radio frequency (RF) to enable a range of remote sensors which will automatically talk to the unit when high levels of humidity and CO2 are measured. The DRI-ECO-LINK-HC will react by boosting the fans speed to maintain good air quality and providing a healthy living environment.
  • Hall Loft Control Unit with optional sensors and controllers
  • For homes with lofts. Supplied with all ancillaries required for suspension
  • Whole House Condensation Control
  • Modern Circular Diffuser
  • 7 Year Warranty

Does PIV help with condensation?

Yes, a positive input ventilation (PIV) unit can help to reduce or eliminate condensation in a home. Condensation occurs when warm, moist air comes into contact with a cold surface, such as a window or wall, and the moisture in the air condenses into droplets. This can lead to damp and mold problems, which can be harmful to health and can cause damage to building materials.

A PIV unit can help to reduce condensation by introducing fresh, filtered air into the home and circulating it around the building. This can help to maintain a balanced level of humidity, which in turn can reduce the likelihood of moisture condensing on surfaces. By increasing air circulation, a PIV unit can also help to prevent stagnant air from building up, which can exacerbate condensation problems.

It’s worth noting that PIV units are not a magic solution to all condensation problems, and there may be other factors at play that need to be addressed. For example, if there are areas of the home that are particularly cold or poorly insulated, this can increase the likelihood of condensation occurring. In such cases, additional measures such as improving insulation, increasing heating, or using dehumidifiers may also be necessary to fully address the issue.

Where are PIV units installed in the home?

PIV units are typically installed in the loft or attic space of a home, where they can draw in fresh air from outside and distribute it around the building. The unit is usually connected to a duct that runs from the loft space down to a central location in the home, such as a hallway or landing, where the fresh air can be distributed throughout the building.

It’s important to ensure that the PIV unit is installed correctly and in accordance with any relevant regulations or building codes, and that it is maintained regularly to ensure that it continues to function effectively. A professional installer or ventilation specialist such as ourselves can provide advice and guidance on the best location for a PIV unit and the installation process.

Do PIV systems make the house cold?

One thing to note is that a PIV system will bring in colder air than what is already inside your property. That means that if your house was already cold when you turned on the system, it will become colder as more cool air enters through the vents. To combat this issue, many homeowners install heat recovery systems alongside their PIV units, which helps maintain a more consistent temperature throughout their homes.

What are the benefits of installing a PIV unit?

  1. Improved indoor air quality: A PIV unit can bring in fresh, filtered air from outside and circulate it around the home, helping to remove stale air and pollutants, such as allergens, dust, and odors, which can be particularly beneficial for people with allergies or respiratory issues.
  2. Reduced condensation and dampness: By increasing air circulation, a PIV unit can help to reduce the build-up of moisture in the home, which can lead to damp and mold problems. This can also help to reduce the risk of condensation on windows and other surfaces.
  3. Lower energy bills: PIV units can help to reduce heating costs by reusing heat that is already in the home. By circulating air around the building, a PIV unit can help to distribute warm air more evenly, reducing the need for additional heating in certain areas.
  4. Quieter than other ventilation systems: PIV units are generally quieter than other types of ventilation systems, such as extractor fans or mechanical ventilation with heat recovery (MVHR) systems, which can be beneficial for those who are sensitive to noise.
  5. Easy to install and maintain: PIV units are relatively easy to install and maintain compared to other types of ventilation systems, which can help to keep costs down and ensure that the system continues to function efficiently over time.
  6. Improved thermal comfort: By circulating air around the home, a PIV unit can help to regulate the temperature more effectively, reducing the likelihood of cold spots and improving overall thermal comfort.
  7. Reduced carbon footprint: A PIV unit can help to reduce the carbon footprint of a home by improving energy efficiency and reducing the need for additional heating.
  8. Increased lifespan of building materials: By reducing the level of moisture in the air, a PIV unit can help to prevent damage to building materials such as wood, plaster, and insulation, potentially increasing their lifespan.
  9. Improved sleep quality: A PIV unit can help to promote better sleep by improving air quality and reducing the levels of allergens and pollutants in the air.

Positive input ventilation systems are quickly becoming the preferred method for improving IAQ in buildings due to their energy efficiency and ability to filter out pollutants from the atmosphere. Not only do these systems help improve occupant health but they also help reduce energy bills due to their low-energy requirements. If you’re looking for an effective way to improve IAQ in your home or office space without spending too much money or time on maintenance, then consider installing a positive input ventilation system today!

Have any questions? contact us below.

6 thoughts on “What is Positive Input Ventilation (PIV)?

  1. Colette Ryan says:

    Do the units works on electricity and are they expensive to run?

  2. Micheal macgillicuddy says:

    Hello just stumbled across your product on line… Its sounds good. Is it as good as the heat recovery system? Does it take more than one unit in a house.. Ie 3 bed bungalow..
    Could I get more info on this please.

  3. Mark O’Hara says:

    I am very interested in an attic based ventilation unit, but not to sure which one is best ?

  4. Gearoid O'Donovan says:

    Hi, our home is 70% flat roof, will it still work. Some rooms are OK but others are fairly bad. Is one piv unit sufficient?? Any advice would be greatly appreciated.

  5. Breda says:

    Looking to solve issue of condensation on main bedroom window due to en-suite with no window- just wondering if this would be effective.
    If yes, which unit would you recommend?

  6. Regina Pendleton says:

    Good afternoon.
    So many eco units to choose from. How can I select the right one for me.
    I have a one bed annex which suffers from condensation.
    Desperately need to book installation of one if your eco units a to earliest convenience.

    Just need your expert help in knowing which unit to purchase .
    Regards. Ps. Happy 2023.

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