The Ubbink Vepac Terminal is an in-line service terminal for use in slated roofs in pitches of 25° and over. The UB39 is suitable for terminating 110mm diameter mechanical extract systems and soil & vent systems where an external pressure test is not required. For aesthetic purposes, the UB39 terminal matches the UB11 roof ventilating slate.The UB39 has a free vent area of 7,800mm2 and a pressure/airflow resistance reading of 19.0 Pascals (reading taken at 100m3/h). Features & Benefits Suitbale for slate roofs Suitable for pitches of 25 degrees and over It has a free vent area of 7800mm2 Product Specification Material (Slate vent and adaptor): UV Stabilised High Impact Polystyrene Material (Pipe): Polyethylene Colour: Anthracite Diameter of Spigot measures: 110mm. Width: 285mm. Height: 380mm.