The UB17 Slate Space Vent is a roof void ventilator for use in slates. The base as supplied is a direct replacement for a 600 x 300mm slate. When the 25mm side bands are trimmed off and the inner set of fixing points are used, the unit is then a direct replacement for a 500 x 250mm slate. The UB17 is suitable for both high and low level ventilation and has a free vent area of 10,000mm2.The vent can be adapted for use as a service terminal with a UB17 adaptor 100140294390. Features & Benefits Suitable for use with slates Large free vent area Product Specification Length: 150mm Width: 220mm Depth: 40mm Material: Polyethylene Colour: Black Free vent area: 10,000mm2.