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This adjustable grey mushroom vent can be fitted to most steel or glass-fibre roofs and ensures adequate, adjustable ventilation without the need to leave windows open. This vent is designed for a roof 25-45mm thick. If your roof is thinner, parts of the vent can be shortened. Aperture needs to be 130mm External diameter is 190mm The Dome airflow is as follows: (note this fan is NOT electric) - 3-12m3/h with the fan off and at wind speed of 1-4m/s - 65m3/h with the fan speed set to half - 105m3/h with the fan speed set to full
To allow the vent to close and open a small circlip has to be removed from the centre, by first removing the three screws holding the dome in place This vent is Manual not Electric