Over fascia ventilator with 10,000mm2/m airflow.Manufactured from polypropylene to enable vent to be cut with a rip saw on site without shattering.Unique design provides effective resistance to both driving rain and large insects. Supplied in 1m lengths. Black in colour. Gutter spacers are sold separately. For use with clipped eaves (fascia tight to brickwork) and integral concrete gutters (fix to batten on wall head or bottom tile batten). No fascia situations.