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Positive Input Ventilation

PIV - Low Cost Whole House Ventilation

A Positive Input Ventilation (PIV) unit is a low cost alternative to MVHR and a more energy efficient option than traditional extract ventilation. By gently supplying fresh, filtered air into your home, taken from either your ventilated attic or an exterior grille, the PIV creates a positive indoor air pressure to 'push' old, contaminated, vapour laden air out of your property, at the same time eliminating cold draughts from trickle vents and other gaps in the building fabric. A PIV will normally resolve any damp and mold issues within weeks if not days providing a healthier, fresher indoor environment.

How do PIVs work Find out how PIV's work

How PIVs workThe installation of a low energy positive input ventilation unit will completely replace the air in your home around 20 times a day, the recommended rate to maintain good air quality. A PIV unit tempers the fresh air supply by recovering unused warm air from the attic. During Winter months a small electric heater can be used to take the chill off the air supply. A solar energy collector is also now available to warm the incoming air supply and thereby reducing your overall heating demand.

A PIV unit filters out external pollutants, dust, traffic fumes and pollen thanks to high efficiency G4 filters. The air movement created by the PIV will also help to remove a significant amount of the dust particles inside the property too.

PIV running costs PIV maintenance and running costs

A PIV unit will operate with little or no regular maintenance other than a very occasional filter clean or vacuum. Running 24x7 with minimal energy consumption at an almost imost imperceptable noise level, a typical PIV unit will cost less than £10/year to run and will provide significantly more energy into the home than the energy it consumes, providing a considerable net energy gain.

loft mounted MVHR units See our heat recovery ventilation units


For sales please email sales@solarcrest.co.uk or call 01625 423020


Nuaire Drimaster HEAT
PIV Unit with Integral Heater
The Drimaster HEAT is a PIV unit with integral heater to automatically temper the incoming air on particularly cold days. Meets 2010 building regs, saves energy, removes dust and prevents condensation
Nuaire Drimaster HEAT
Our price:£294.00 each + VAT
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Nuaire Drimaster 365
PIV unit with climate control
The Drimaster 365 is a PIV unit with automatic climate control to pull air from the attic or outdoors depending on the required indoor air temperature. Meets building regs, saves energy, filters the air supply, removes dust and prevents condensation.
Nuaire Drimaster 365
Our price:£420.00 each + VAT
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Nuaire Flatmaster 2000
PIV unit for flats & unvented attics
The Flatmaster 2000 is a PIV unit with integral heater designed for flats, apartments and properties with no vented attic space. Meets 2010 building regs, saves energy, removes dust and prevents condensation
Nuaire Flatmaster 2000
Our price:£256.00 each + VAT
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Vent-Axia PoziDry PIV
PIV unit for vented attics
The Vent-Axia PoziDry Positive Input Ventilation unit offers a quick and simple solution for properties with high levels of condensation, the typical cause of damp and mould.
Vent-Axia PoziDry PIV
Our price:£391.59 each + VAT
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