The Ultimate Guide to Positive Input Ventilation (PIV)

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The Ultimate Guide to Positive Input Ventilation (PIV)

Managing a healthy indoor environment can be a challenge with modern building techniques that heavily insulate homes. This insulation, while great for energy efficiency, often leads to issues like condensation, mould, and poor indoor air quality. Positive Input Ventilation (PIV) provides an effective solution, bringing continuous fresh air into properties and diluting  stale, moist air.

Whether you’re a homeowner, private landlord, or Social Housing Provider  responsible for ensuring healthy living spaces, this guide will explain the principles of PIV, how it works, and why it’s a game-changing solution for ventilation problems.

What is Positive Input Ventilation (PIV)?

Positive Input Ventilation (PIV) is a whole-home  ventilation system that works by gently supplying fresh  filtered air into a property . By drawing in air via  the loft space or directly from outside  (in flats), PIV systems continuously dilute, displace, and replace moisture laden air that builds up in a property. . The filters on each system will remove particles as small as pollen as standard, although higher grade filters are available.

This controlled airflow reduces condensation, minimises the risk of mould growth, and improves indoor air quality, creating a healthier, moisture-free living environment.

 

Whole-house ventilation

Provides fresh air supply throughout the home

Filtered air

Removes pollutants, allergens, and particles, benefiting asthma and allergy sufferers.

Energy efficient

Utilises heat recovery to warm incoming air, reducing heating bills.

Discreet installation

Usually installed in loft spaces or hallways with minimal visual impact.

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Why is PIV Needed?

The drive for better energy efficiency in buildings has led to heavily insulated and airtight homes. Without proper ventilation, these homes trap moisture from everyday activities like cooking, cleaning, and bathing, leading to issues like condensation and mould.

With over 1 million PIV systems installed in UK homes, this solution has become a popular and proven method for maintaining healthy indoor environments.

PIV systems address this by:

Controlling Humidity: Reducing high humidity levels that lead to condensation and mould.

Improving Air Quality: Removing indoor pollutants from activities like cooking or cleaning.

Health Benefits: Supporting asthma and allergy sufferers by filtering out allergens and pollutants.

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How Does Positive Input Ventilation Work?

PIV operates on a simple but effective principle:

  • Air Intake: The system draws air from the loft (or a wall vent in flats). Loft-based units can utilise the naturally warmer air in loft spaces, further optimising energy efficiency.
  • Filtration: The incoming air passes through high-efficiency filters to remove particles, pollutants, and allergens.
  • Distribution:Filtered air is gently pushed into the home through a centrally located diffuser, creating positive air pressure.
  • Displacement: Stale, moist air will exit the property via the trickle ventilators and myriad of small gaps in the building structure.

Because the air is constantly being changed, it prevents water vapour from building up and settling on cold surfaces, eliminating condensation and reducing the risk of mould.

3 Phillips House - mould growth in bathroom

Top Benefits of PIV Systems

  • Condensation and Mould Control: PIV is proven to eliminate condensation issues  and prevent mould growth occurring.
  • Improved Indoor Air Quality: Filters out external pollutants like pollen and traffic fumes while reducing internal pollutants.
  • Energy Efficiency: Many systems utilise the heat already present in loft spaces, reducing energy consumption and lowering heating costs.
  • Low Running Costs: Non-heated units can operate for less than 1p a day, making them a cost-effective solution.
  • Healthier Living: Creates a dry, allergen-free environment ideal for asthma and allergy sufferers.
  • Discreet and Low Maintenance: Installed in lofts or hallways with minimal visual impact and only requiring filter cleaning or replacement every few years.
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Who Can Benefit from PIV?

PIV systems are suitable for:

  • Homeowners: Protect your property’s structure and improve indoor air quality for your family.
  • Landlords: Ensure tenant satisfaction and comply with housing regulations by solving damp and condensation issues.
  • Housing Providers : Address environmental health concerns and create better living conditions for your residents.

Common FAQs About PIV Systems

Yes, PIV systems are a cost-effective, non-invasive solution to eliminate condensation and mould. They require minimal structural changes and deliver noticeable results in air quality and humidity control within days of installation.

No, PIV systems often utilise already warm loft air and many units come with optional heaters to temper incoming air during colder months. This ensures warm air is introduced into the home without affecting comfort.

Absolutely! PIV units can be wall-mounted in flats or basements, providing the same airflow benefits as loft installations in houses.

Older homes with natural gaps may not require trickle vents. However, highly sealed modern properties could benefit from additional background ventilators to facilitate efficient airflow.

Depending on the model and installation complexity, costs can range from £750  to £1000. . This typically includes site surveys, installation, and a warranty for peace of mind.

No, PIV systems must be installed by qualified professionals. This ensures the system is tailored to your property’s needs, installed safely, and complies with Building Regulations.

PIV systems are low maintenance. Filters typically need to be cleaned or replaced every five to seven years for loft mounted systems and every 12-18 months for wall mounted systems.

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Take Control of Your Home’s Air Quality Today

Positive Input Ventilation is a proven solution to combat condensation, mould, and stale indoor air. It’s efficient, cost-effective, and boosts both your property’s health and its inhabitants’ well-being.

Whether you’re a homeowner looking for a healthier living space, a landlord ensuring tenant satisfaction, or a government body committed to better housing standards, PIV offers a practical and impactful solution.

Speak to an expert today to explore if PIV is the right fit for your property!

Request a callback

Don’t wait for complaints or risks to escalate. Partner with Vortice to ensure compliant, durable solutions tailored to the needs of the social housing sector. Contact us now to schedule your free consultation and take the first step toward compliant, healthy homes.

Contact our social housing team for any enquiries.

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