An extract fan is designed to remove air from a single room, such as a bathroom or kitchen, where moisture and odours accumulate. It works by sucking out stale air, creating negative pressure in that space.
A P.I.V unit, on the other hand, works for the entire home. Instead of extracting air, it introduces fresh air from outside and distributes it evenly, creating a gentle airflow that forces moisture and pollutants out through natural leakage points like vents and gaps around windows and doors.
