Positive input ventilation (PIV) brings filtered air into your home to improve airflow. In suitable homes it can help reduce condensation and the mould risk that comes with it.
Wondering if PIV could suit your home? Ask us.
“We had our PIV system installed 27.08.25 by Shaun and Harrison. They were incredibly polite, helpful and knowledgeable. We are very pleased with the system and the way they fitted it. We would highly recommend Boxt Electrical. We would definitely use them again.”
Mandy Sinden
Google Review
A PIV system uses a fan unit to supply a steady flow of filtered air into the home. This gently pushes stale, moisture-laden air out through the normal routes air leaves a building, helping to keep air moving.
A PIV unit gently introduces filtered air into the home, helping to move stale, moist air out and keep air circulating.
In suitable homes, improving ventilation can help reduce condensation on windows and walls, and the mould risk that comes with it.
Whether PIV is right depends on the property, its layout and the ventilation already in place. We talk this through first.
PIV is not a guaranteed cure for damp. Leaks, penetrating damp and rising damp need to be properly diagnosed and repaired. PIV is best suited to condensation-related problems.
Not on its own. PIV can help with condensation-related problems in suitable homes, but leaks, penetrating damp and rising damp have different causes. These need to be diagnosed and repaired first.
Not always. Loft-mounted units are common in houses, but other arrangements exist for different property layouts. We discuss what would work for your home.
Call or email us with a short description of your property and the problem. We can then advise on next steps and arrange to take a look.
Tell us where you are in Cornwall and what you have noticed, and we will help you work out whether PIV suits your home.
Your local electrical team, serving homes and businesses across Cornwall.
