CURV® Cowled Universal Roof VentThe Cowled Univeral Roof Vent is designed to provide a quick and simple solution to the problems of roofspace ventilation and mechanical extraction soil stack termination through a wide variety of roof coverings. It is especially useful on jobs where the installer may not know what the roof covering is. Designed to suit both large and small format interlocking tiles, both flat and profiled in design, including deep bold roll styles of tile. The vent