Introduction
Positive Input Ventilation (PIV) sounds technical—but it’s actually a simple, effective way to prevent mould without blasting cold air into your home.
If you’re struggling with condensation, musty smells, or recurring mould, a PIV unit could be the quiet hero your home needs.
What Is a PIV Unit?
A PIV system gently pushes clean, filtered air into your home—usually from the loft. This steady airflow dilutes indoor moisture and pollutants, forcing them out through natural gaps and extractor fans.
It’s a whole-house solution that:
- Prevents condensation
- Reduces mould growth
- Improves indoor air quality
- Helps reduce allergens
Common Myths (and the Truth)
“It’ll make my house cold.”
Nope—modern PIV units come with built-in heaters that pre-warm the air.
“They’re noisy.”
Most units run silently—you likely won’t even know it’s there.
“It won’t work in a flat.”
There are wall-mounted PIV systems designed just for flats and apartments.
Ideal For:
- Homes with chronic condensation
- Flats with limited ventilation
- Families with asthma/allergy sufferers
- Landlords trying to avoid mould-related complaints
Why OVM Recommends PIV’s.
We’ve installed hundreds of PIV units across the UK—and the feedback is always the same: “I wish I’d done this sooner.” They’re low-maintenance, energy-efficient, and a smart investment in your health.
Final Though
PIV might sound like just another acronym, but it can make a big difference in the way your home feels—and how you feel inside it. Want to know if it’s right for you? Book a free survey and we’ll take a look.
