10,000mm2/m airflow Narrow grill to block out insects The G800 Continuous Soffit Ventilator is designed to provide a solution to roof ventilation where a traditional soffit board is specified. The UPVC strip is screwed on to the fascia and securely supports the soffit board which slots into the self-retaining mouth. Airflow is guaranteed through a series of evenly spaced slots, narrow enough to keep out large insects but large enough to prevent the vent from becoming blocked.