This Lomanco Vent Turbine set should be used when the turbine must be place high above the surface of the roof to catch the wind. This can include instances where the roof edge is higher than the location of the vent shaft so could block wind from hitting the turbine. Why should I use this wind-powered vent turbine? For installation in multi-storey apartment blocks and towers, this vent replaces conventional central electric ventilators for a quieter, cheaper and more efficient wind-powered vent system. The set combines the most powerful Lomanco turbine, a TIB14, with an extension shaft and base. The turbine is made entirely from aluminium so it rust-proof and requires no maintenance. The folded edges of the turbines vanes mean water cannot ingress into your ventilation shaft. A 14” turbine moves up to 37% more air than 12” so the slight increase in size allows you to reap the benefits. Alongside all of these benefits the TIB14 comes with a lifetime warranty - please note, this lifetime warranty applies to residential use only. In instances where a Lomanco turbine has been installed for commercial use, the product is covered by a 15 year warranty. The extension and base come with a 2-year warranty. This set includes Lomanco TIB14 14” turbine head 50cm extension shaft A base This product must be installed on the outlet of an existing vent shaft.