Whole House Ventilation System

by | Mar 2, 2025 | Advice, Solution, Ventilation

A whole house ventilation system, also known as “positive input” ventilation (PIV) is when the naturally warmed air (from loft) is drawn into a fan that filters and freshens the air and delivers it back into the main living spaces of a home.

Through this process the damp air is naturally forced out and replaced by the refreshed, healthy air from the fan.

The invention of these systems originated in the UK during the 1970’s.

The EnviroVent Loft Mounted Unit is a sophisticated whole house ventilation and condensation control unit for homes with a loft space.

(Download Envirovent PIV Brochure Here)

The unit gently ventilates the home from a central position on the landing in a house or the central hallway in a bungalow to transform a stagnant and stale atmosphere into a fresh and healthy environment.

Some of the benefits include:

  • Superior long life filters
  • Ultra Low Watt DC motor technology
  • Integral Hours Run Meter (as standard)
  • Integral intelligent comfort heater (LV2-EVL-H only)

Positive Input Ventilation (PIV), or more simply, in-house ventilation, is very important in making your house a healthier place to live. The in-house air pollutants and moisture produced can contribute to an unhealthy environment. Evidence of this includes:

  • High dust levels,
  • Condensation on windows and walls,
  • Mould and mildew on ceilings, and
  • A generally damp, cold feeling inside the house

Everyday living activities causes these problems: such as cooking, drying clothes in the drier, and showering all lead to moisture being produced into the household atmosphere; using aerosol sprays produces pollutants, warming the house via freestanding gas heaters, the main by-product of gas being water vapour.

We also give off an estimated 2 Litres of moisture (per person) from our own human bodies each day.

If you are producing or introducing moisture into your home, then mould can generate.

If you do live in a “damp” house, i.e. you have over 60% humidity levels/moisture content in the air, there is also the problem of dust particles being trapped and settling on moist surfaces, which then the mould spores will land on and can generate more mould.


Solution:


PIV gently supplies tempered, filtered air back into the home using heat from within the roof space.

Customers have commented on improvements in their previous health troubles with conditions such as asthma and respiratory infections, due to installing a system to improve the air quality of their home.

PIV systems have also been known to additionally benefit the customer by way of reduced energy usage (a net energy gain): using less energy to heat the dry air within your home, rather than heating the moisture particles in a damp house (which uses more energy.)

Plan ahead and be safe

Plan ahead and don’t undertake any electrical work you are not qualified to do, you need to be registered under Part P of the building regulations. Goodwin Electrical in Plymouth can provide a free quote we are registered Part P with NICEIC. We are usually booked up at least 2 weeks ahead so do not leave it until the last minute before contacting us.

For a free Whole house Ventilation survey call Goodwin Electrical on 01752 916047 or fill in our Free Quote Form

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