This Lomanco Vent Turbine set can be used in applications where one turbine isn’t strong enough to secure the ventilation requirement in multi-storey buildings. For buildings over 7 storeys, this set is designed to replace traditional central electric ventilators which can be noisy and expensive to run. In a year this Lomanco vent system will pay for itself. Why should I use this wind-powered vent turbine? The set uses two of the most powerful Lomanco vents, TIB14, installed on the same base with two separate necks to ensure maximum airflow efficiency. The turbines are made from aluminium so they’re rust-proof and come 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 base is made from galvanised steel, with a 2-year warranty. The folded edges of the turbine vanes mean water cannot ingress into your ventilation shaft. A 14” turbine moves up to 37% more air than 12” so by installing two TIB14 turbines you’re increasing air flow by a large amount. This set includes: 2 x Lomanco TIB14 14” turbines 2 x Lomanco TIB14 turbine necks A rectangular base - 46cm x 96cm This product must be installed on the outlet of an existing vent shaft.