Positive Input Ventilation Unit

Take control of condensation!

Windows dripping with condensation, water pooling on sills, damp curtain, black mould growth, mildew, musty smells etc…Welcome to a typical UK home in winter!

External and internal pollutants can have a significant impact on the quality of air in every home and consequently on occupant’s health. Poor ventilation is a wide scale problem. It is estimated that one in five UK households are poorly ventilated, leading to problems with streaming windows, mould growth and poor indoor air quality.

Condensation dampness is the major indoor air pollutant caused by modern living. Energy-efficiency measures such as cavity wall insulation and double glazing make homes warmer by sealing in the heat. But as a result, the humid, stale air becomes trapped inside the home leading to condensation and the appearance of black mould.

Through everyday life (cooking, cleaning, breathing) the average family produces over 17 pints of moisture a day. Condensation forms when this moisture comes into contact with cold surfaces within the home. This is not only unpleasant but is damaging to the fabric of the building and creates unnecessary costs for the registered landlord in decoration and maintenance.

Poor indoor air quality has significant impact on health and wellbeing of occupants.

  • Smoking
  • Radon gas
  • Open fires
  • Candles and incense
  • House products such as air fresheners, hair sprays, cleaning products, paints and wood preservatives, fuel burning appliances – E.g. cookers
  • People, pets and plants
  • Excess moisture

Ventilation is critical to home comfort and improved health. Adequate ventilation improves air quality and rids the home of air pollutants. It controls the moisture levels in the home, preventing condensation dampness and black mould from forming.

These factors combine to enhance the comfort and indoor air quality of the home and ensure a healthy environment. Effective ventilation also contributes to preserving the structural integrity of the home, reducing maintenance costs and adding to the home’s value.

Contact us today for a no obligation quote: 0800 068 33 87

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    Moisture in the air will form condensation (droplets of liquid water) when it comes into contact with a cold surface such as a window. We all get condensation on the windows from time to time, but this isn’t necessarily a problem if it clears up quickly.

    Problems start if the water builds up to the point where it starts to cause damage. And if its building up somewhere other than on the window, you many not notice until the wallpaper starts to peel or black mould starts to grow. This is most likely to happen in places that are colder than the rest of the house, such as exposed corners and where there is a gap in the insulation, and where the air can’t circulate freely, such as behind furniture.

    If you do have mould growing, it’s good to clean it off straight away to minimise any health risk, but you also need to fix the underlying damp problem to stop it coming back. If you don’t have any leaks or rising damp issues then the problem is almost certainly condensation, and there are several things you can do to help avoid problems in the future.

    • Reduce the amount of moisture produced in the first place by keeping lids on pans when cooking, drying clothes outside when possible, and if you use a tumble dryer, making sure it’s vented to the outside.
    • Ventilate so the moist air leaves the house – always use the extractor fan when you’re cooking, showering or bathing, leave any window vents open, and don’t block off any other vents.
    • Make sure air can circulate by leaving gaps between furniture and the wall.
    • Try to avoid cold spots – if there is a gap between your wall insulation and your loft insulation, for example, try to get this fixed as it will attract condensation and possibly mould.
    • If you have tried all of the above measures and you still have problems with condensation then please contact us to discuss our PIV Units.
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    Positive Input Ventilation Unit


    Our PIV Units have been installed in over 1 million homes in the UK and they provide a continuous supply of fresh, filtered air into the home through positive pressurisation, creating an environment in which condensation and mould growth cannot exist.

    • The No. 1 Home Positive Input Ventilation System discreetly banishes condensation from homes.
    • The system is installed in the roof space of the home and the ceiling located louvre is unobtrusive enough to fit in with the décor of any home.
    • A true ventilation system that uses nature’s fresh air to ventilate your home.
    • This fresh air replaces the moist, damp air created by everyday living in the home. Unlike a conventional de-humidifier, the Loft Ventilation system is quiet, requires minimal maintenance, does not require emptying and is concealed in the attic.
    • The system ventilates the home from within, thereby eliminating the need to keep windows open!

    With so many years of experience, you can rely on No. 1 Home and our professional team of tradespeople and surveyors to deliver exceptional results when tackling indoor pollutants in Bournemouth and across Dorset.

    We will be able to organise a convenient date and time to come and survey your property and determine the presence of indoor pollutants.

    If you can benefit from superior treatment, get in contact with our team today on

    0800 068 33 87

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    What clients say


    No.1 Home

    The team of two worked well with a very high standard and were proud of their finished work. I was very pleased and would like to recommend them to anyone.

    Mrs Mariner

    No.1 Home

    I was very pleased with your team today, they arrived early and I am very happy with the work carried out. My property has been left clean and tidy. I would recommend this company to anyone.


    No.1 Home

    The team who carried out the work at my home today was spot on, they arrived on time and carried out excellent work. They left my property in a clean and tidy order. I will be using your services again and would recommend.

    Mrs Green

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    0800 068 33 87