The Manthorpe In-Line Slate Ventilator is designed to provide a quick and simple solution to the problems of roof space ventilation and mechanical extraction through a roof covered with natural or man-made slates. The vents flush profile with its lightly textured finish helps to maintain an unbroken appearance to the roofline whether used at high or low level. The tortured path through the 4mm louvred grill and internal geometry is designed to maintain airflow whilst channelling any water ingress out of the vent and on to the roof covering. A protective skirt around the vent also helps to weatherproof the laps with the surrounding slates. Discreet, unobtrusive design Suitable down to 22.5 roof pitch For use with 600 x 300mm format slates Can be used with smaller 500 x 250mm slates Wind tunnel tested at the BRE Built in spigot, no need for an adaptor Protective edge skirt improves weatherproofing 8,800mm/m of free vent area per unit Ventilator Spacings to Achieve Required Vent Area 5,000mm/m at 1.76m Centres 10,000mm/m at 0.88m Centres 25,000mm/m at 0.35m Centres