The Timloc Vertical Extension Sleeve Black is used to fit between the upper and lower parts of the telescopic underfloor ventilator to accommodate different wall, cavity and brick courses. The product comes with a plastic finish and has a height of 150mm. It is manufactured using plastic making the product durable and lightweight. The vertical height of the ventilator unit adjusts to suit between 3 and 5 brick courses (225-375mm) with a minimum cavity width of 50mm. Purpose-made accessories elim
