This VP 8 Vent Turbine Base is the base needed for and compatible with Turbine IB vent head. When installed correctly with Turbine IB the completed system will ventilate a mix of roofs, vent shafts, attics, production plants, cellars and more. The effective ventilation turbine will expel any unwanted moisture improving the life span of the roof and the building below. Turning with the wind, this vent turbine system once installed will continuously ventilate without any need for electricity, perfect for saving costs and emissions. This VP 8 Base is 360mm x 360mm, the square base adjusting to roof pitches from 0 to 27. Manufactured from entirely rust-free aluminium, this base requires no maintenance or attention however, all Lomanco vent turbines have a Lifetime Transferable Warranty so you can rest assured that the vent you install will work to the best of its ability for you for a long time. Please note: This product is ONLY a vent turbine base. To install a complete vent turbine system the Turbine IB8 vent head must also be purchased.