The Manthorpe in-line plain 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 plain tiled roof. The vent is quick and easy to install, taking the place of a 3 plain tiles with no need to cut the battens. The in-line profile helps to maintain an unbroken appearance to the roofline whether used at high or low level. In-line and discreet low profile design 4mm louvred flyscreen grille Profiles suits all top tile manufacturers. Suitable for use down to a 35 degree roof pitch Fully independently wind tunnel tested.  Base outlet feeds directly into roof space, adaptor available for mechanical extraction Adaptor available for mechanical extraction.