What are the structural weaknesses and contamination risks associated with loft-dependent Positive Input Ventilation (PIV) systems?

What are the structural weaknesses and contamination risks associated with loft-dependent Positive Input Ventilation (PIV) systems?

WarningIn homes with lofts, PIV systems risk drawing insulation fibres, mould spores, and dust into living spaces. If filters fail or degrade, these pollutants bypass purification and circulate indoors, posing health hazards—especially to occupants with respiratory conditions.
Warning
Effective PIV installation demands rigorous loft sealing to prevent air leaks from adjacent roof spaces. Inadequate isolation compromises air quality and system efficiency, requiring professional assessment and maintenance.

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