Mini Uni-Line Slate Vent is a universal In-line Slate Vent that suits most small natural slates. PERFORMANCE / TECHNICAL DATA Provide 12,000mm2 effective vent area (6,500mm2 effective area) Product features & benefits In-line design Fully wind tunnel testedBuilt in downpipe allows direct ventilation to roof space No soil/mechanical adaptor required Area of application Suitable for: 400mm x 250mm (16 x 10) and below natural double-lap slates High or low level roof space ventilation Roof pitches of 22.5 and avove Small natural and fibre cement slates Material UV resistant Polypropylene Related products Uni-Flexipipe KG979900 Underlay Seal KG973100 Regulations and certifications Complies fully with relevant Building Regulations and British Standards. Installation The vent is positioned directly in-line with the slates below, and an inverted T opening is cut within the underlay to accommodate the downpipe. To ensure the integrity of the underlay a Klober Underlay Seal is strongly recommended. Once the downpipe has been located through the underlay opening, the slate vent is located on and fixed to the slate batten. The slates either side of the vent are laid and trimmed if necessary.