Turbine IB is 8 inches, or 203mm, in diameter for installation on a range 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 will continuously ventilate without any need for electricity, perfect for saving costs and emissions. The turbine itself is manufactured from aluminium, moulded into 18 curved vanes with rolled edges to deflect water from entering the shaft. Due to its aluminium manufacture the turbine won’t rust and it requires zero maintenance. Riveted at every connection, this turbine will withstand wind speeds of up to 110 mph. Alongside the zero maintenance, high-quality performance manufacture, all Lomanco turbines come with a Lifetime Transferable Warranty, which is transferable from the original owner to subsequent owners - 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. Please note: This product is a single turbine head. The VP 8 base must also be purchased for a complete vent turbine set. The VP 8 base adjusts to 0° to 27° roof pitches so the entire set can be used on many types of building with its 360mm x 360mm flashing base. When the IB vent turbine is combined with the VP 8 base you can make great energy savings as well as prevent ice build-up in winter.