Positive Input Ventilation (PIV) is a ventilation system that improves air quality and reduces moisture levels in a building by continuously supplying fresh, filtered air. It works by drawing air from outside or the loft space and gently distributing it into the living areas through a central unit, typically installed in the ceiling of a hallway or landing.

The PIV system pushes out stale, humid air, reducing condensation, mold, and dampness, and improving overall indoor air quality. It is often used in homes that suffer from poor ventilation or excess moisture, helping to maintain a healthier living environment by controlling humidity and preventing condensation-related issues. PIV systems are energy-efficient and can help reduce heating costs by circulating warmer air from the loft or outside.

You may need Positive Input Ventilation (PIV) if you notice the following signs in your home:

1. Excess Condensation: Frequent condensation on windows, walls, or ceilings, especially during colder months, can indicate poor ventilation.
2. Mold and Mildew Growth: Dampness and the presence of mold, particularly in corners or around windows, suggest high humidity levels.
3. Damp or Musty Odors: Persistent musty smells are a sign of stagnant air and high moisture levels, which can be mitigated by PIV.
4. Poor Indoor Air Quality: If your home feels stuffy, or occupants experience allergies or respiratory issues, PIV can help improve air circulation and filtration.
5. Recurring Dampness Problems: If damp or condensation problems persist despite other efforts, PIV may provide a more consistent solution by improving airflow throughout the house.

If you notice any of these issues, a PIV system could help improve air quality and reduce moisture-related problems.

A Positive Input Ventilation (PIV) system typically lasts 10 to 20 years with proper maintenance. The lifespan depends on factors such as the quality of the unit, the environment it operates in, and how well it is maintained. Regularly cleaning or replacing filters and ensuring the system is free from blockages can help extend its longevity. Periodic inspections by a professional will also ensure the system continues to function efficiently over time.