Positive Input Ventilation
(PIV)
Our Positive Input Ventilation (PIV) systems offer a simple and effective way to tackle condensation. By gently bringing in a steady flow of fresh, filtered air, they help reduce excess moisture and create a healthier, more comfortable home environment.
A PIV unit works by gently bringing fresh, filtered air into your home. It draws in air, cleans it through filters, and then distributes it throughout the house. As this fresh air moves around, it gradually replaces stale, humid air by diluting and pushing it out.
Since the air is always circulating, moisture doesn’t have a chance to settle on cold surfaces like windows or walls—so condensation is kept at bay. The humid air naturally finds its way out through small gaps around the home, like windows, door frames, or even keyholes.
PIV is now the UK’s most popular low-energy ventilation solution and is helping over a million homes stay fresher, drier, and healthier.
1. Fresh air enters the loft space from outside
2. Warmth from the home gently heats this incoming air before it passes through the PIV unit’s filters
3. The filtered, tempered air is then softly circulated throughout the home
4. Meanwhile, stale and humid air is naturally pushed out through small gaps and vents
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