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An over fascia vent is typically used in roofing and ventilation systems to allow air circulation and prevent moisture buildup in the roof space. It’s installed above the fascia board, which is the long, straight board that runs along the lower edge of the roof.

The 10mm measurement is the depth or thickness of the vent, indicating how far it protrudes from the fascia board. This measurement is important for determining the amount of airflow the vent can provide and how much space it might require during installation.