Domus External Ventilation Grille 100 mm/4 Inch Brown. For use with extractor fan ducts. Concealed fixing points. Anti-insect screen. Requires 4 x No 8 woodscrews and rawlplugs (not supplied). Dimensions: 155mm wide x 155mm high x 25mm deep. 104mm fixing centres. 99mm diameter spigot, extends for 18mm. Manufacturer: Domus.