The Manthorpe Double Roman in-line tile ventilator is designed to provide a quick and simple solution to the problems of roofspace ventilation and mechanical extraction / soil stack termination through a Double Roman tiled roof.  In-line and discreet low profile design 4mm louvred flyscreen grille Integral sidelock clip to ensure secure fit Suitable for use down to a 20 degree roof pitch Profiles suit all top tile manufacturers Fully independently wind tunnel tested Base outlet feeds directly into roof space.