This product is part of Timloc’s Underfloor Vent System. It is a vertical extension piece that has been designed to be used with the Telescopic Underfloor Ventilator. This extension fits between the upper and lower sections of the Telescopic Underfloor Ventilator. It provides an additional 2 brick courses to the ventilator. This product is used when the height difference is bigger than 5 bricks. Once a section of the vertical extension is attached to the Telescopic Underfloor Ventilator it will span 6-7 bricks in height. Each extension adds 75mm in height. Features & Benefits Does not restrict airflow through the main telescopic underfloor ventilator Purpose-made accessories eliminate the need for on site modifications Lightweight and easy to handle Durable and totally resistant to decay Robust material Product Specification Added Height: 75mm Colour: Black Quantity: 20