The G405 Cross Flow Fly Screen Panel is designed for open eaves or cottage style situations and to provide a clear air passage between the roof felt and loft insulation. The fly screen section consists of evenly punched holes specifically designed to prohibit the entrance of large insects but wide enough not to be blocked by debris, paint or water droplets (see BS5250 section 6) The G405 is suitable for 400mm rafter centres. Colour Black  Material Lightweight Rigid PVC  Manufacturing Process Vacuum Formed Free Airflow 10,000mm/M equivalent to a continuous gap of 10mm