Profile-Line® Flat Vent is a neat, cleverly designed vent that suits Marley Modern, Redland Mini Stonewold, Russell Grampian and Sandtoft Calderdale profiled interlocking tiles. Properties • In-line design - virtually invisible from the ground. • Choice of four colours. • Fully wind tunnel tested. • Built in downpipe allows direct ventilation to roof space. • Adaptor available for soil ventilation or mechanical extraction. • Robust construction. Material uPVC.