For use with flat roofs, low pitched roofs below 15 degrees, abutment details and where insulation follows rafters. 12x 1m long lengths in black.Over fascia ventilator with 25,000mm2/m airflow with 14x gutter spacers.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. 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.