Explaining Positive Input Ventilation: Advantages, Disadvantages, Price, and Additional Facts
Positive Input Ventilation (PIV) systems, developed by Nuaire in 1972, have proven to be an effective solution for managing ventilation in existing homes. With over 35 years of expertise in renewables and ventilation installation, David Hilton, Homebuilding & Renovating's renewables expert, explains the benefits and considerations of PIV systems.
PIV is a cost-effective solution for problems caused by excessive moisture in the home, such as condensation on windows and damp and mold. The system improves indoor air quality by reducing odors, VOCs, and pollutants, and is clinically proven to help reduce dust mite allergens which can cause asthma and affect allergy sufferers.
PIV units are usually ceiling-mounted and draw air from the loft or from a roof vent mounted on the roof above the loft. A distribution diffuser is typically mounted in the ceiling of the room below it, blowing fresh, filtered air into the home. This creates a slight positive pressure in the home, pushing the stale air and contaminants out through any air gaps in the fabric of the home.
However, there are some factors to consider before installing a PIV system. The system may require additional costs for better controls, extra sensors such as humidity or CO2. PIV systems may also affect thermal comfort levels in the home by drawing cold air from the loft in winter and hot air from the loft in summer.
PIV is less suitable for apartments, homes with vaulted ceilings, or flat roofs due to the need for loft space for the unit. Some PIV systems can include ducted units, according to David Hilton, but these may result in higher installation costs.
It is important to note that Building Regulations Part F must be complied with when installing a PIV system. David Hilton holds membership in the Gas Safe Register and has a Masters degree in Sustainable Architecture, ensuring a thorough understanding of the regulations and installation best practices.
On average, PIV systems cost between £700-£1000 including installation. However, combining PIV units with heaters may undermine its low energy qualities and cause running costs to rise significantly. Other ventilation methods, such as installing an extractor fan or natural ventilation, might be appropriate to investigate for dealing with damp problems.
In conclusion, Positive Input Ventilation (PIV) systems offer a cost-effective and clinically proven solution for improving indoor air quality and managing moisture problems in the home. However, it is essential to consider factors such as installation costs, thermal comfort, and the need for loft space before deciding to install a PIV system.
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