BOOK A DAMP SURVEY 0161 850 6006

Eliminate Condensation, Mould & Stale Air – From Just £895 Fully Installed

If you're tired of waking up to streaming windows, black mould on walls, or that damp, musty smell that never seems to go away, a Positive Input Ventilation (PIV) system could be the solution you've been looking for.

Our expertly installed PIV units work around the clock to introduce fresh, filtered air into your home, helping to reduce condensation, prevent mould growth, and improve indoor air quality throughout the property.

Book a Home Visit

Save £100 during our Summer Sale

For a limited time, take advantage of our Summer Sale Price of just £895 fully fitted by our experienced installation team – a saving of £100 off our usual winter installation price of £995.

This seasonal offer won't last forever. As demand increases later in the year and condensation problems return, our standard installation price reverts to £995. Secure your installation now and enjoy a fresher, healthier home before the colder months arrive.

Book today and save £100 while the Summer Sale is still available


0161 850 6006
Save £100 during our Summer Sale

What Is a Positive Input Ventilation (PIV) Unit?

Imagine your home is like a sealed box. Every day, people inside that box breathe, shower, cook, dry clothes, and boil kettles. All of these activities release moisture into the air. If that moisture has nowhere to go, it builds up inside the house.

Over time, this can lead to:

  • Condensation on windows
  • Damp patches on walls
  • Black mould growth
  • Musty smells
  • Poor indoor air quality

A Positive Input Ventilation (PIV) unit is a system designed to solve this problem by continuously supplying fresh, filtered air into the home.


What Is a Positive Input Ventilation (PIV) Unit?

Positive Input Ventilation (P.I.V.)

A Positive Input Ventilation (PIV) unit is a home ventilation system designed to improve indoor air quality and help control moisture levels in a property. Here's how it works and how it can help reduce damp in your home:

Eradicate damp and poor air quality with a Positive Input Ventilation Unit.


Get a Free Quotation

How PIV Units Work

  • Air Input: The PIV unit typically draws fresh air from the outside or loft space (if clean and ventilated) into the home.
  • Filtration: The incoming air is filtered to remove dust, pollen, and other contaminants.
  • Positive Pressure: The unit gently pushes this filtered air into the living spaces. This creates a slight positive pressure within the home.
  • Moisture and Pollutant Removal: The positive pressure forces stale, moist, and polluted air out of the property through gaps, vents, or natural leakage points.



Book a Home Visit
Damp Proofing Horwich

Where Does the Fresh Air Come From?

Most PIV systems are installed in the loft (attic).

They draw air from the loft space because:

Loft air is generally cooler and drier than the air inside the living areas. The loft naturally receives fresh air through roof ventilation.

The unit then:

  • Draws air into the machine.
  • Passes it through a filter.
  • Pushes the filtered air into the home through a ceiling diffuser.

The diffuser is usually located on the landing ceiling.


How PIV Helps Reduce Damp

PIV units are particularly effective in reducing condensation damp, which occurs when warm, moist air inside the house comes into contact with cold surfaces (e.g., windows or walls). Here's how:

  • Humidity Control: By continuously introducing fresh, dry air and reducing humidity levels, PIV units limit the conditions where condensation forms.
  • Improved Air Circulation: Constant airflow helps prevent stagnant air pockets where moisture can accumulate.
  • Mold Prevention: Lower humidity levels reduce the risk of mold growth, which thrives in damp environments.

Eradicated that damp with a Positive Input Ventilation Unit... Call 0161 850 6006
0161 850 6006