Beyond traditional input ventilation, the PIV Air Source has the facility to source cooler air from outside the building when the temperature in the loft space rises above 25°C. Detecting the rise in temperature, the unit starts to draw air from atmosphere via a temperature controlled diverter mechanism.. That's possibly because the walls that used to attract less visible condensation in the past, got warmer. I fitted a PIV unit in the landing ceiling, followed all the instructions etc, but three weeks on, and with the coldest night last night since I installed it, we are still getting condensation. The landing is quite cold now (apparently, the.

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Positive Input Ventilation (PIV) ventilation systems are the most effective method of curing and preventing condensation dampness. Invented by Nuaire and installed in thousands of dwellings each year, PIV can be a more cost-effective and simple to install ventilation solution, whilst still meeting building regulations.. How Much Will a PIV Unit Cost? There are a number of PIV systems on the market, and each will cost a different amount. Likewise, whether you opt for installation or not will impact the price of the PIV units. You can expect lower-market products to start at around £300-£400, and higher-market PIV systems to cost anywhere around £800-£1,000.