UB34 are specially designed for systems requiring a low resistance terminal and for roof pitches of 25 to 45 degrees These terminals are suitable for mechanical and natural (passive) ventilation installations.The pipework above the roofline is twin walled and incorporates an integral condensation drain. Specially designed for systems requiring a low resistance terminal, the Multivent Service Terminals are suitable for mechanical and natural (passive) ventilation installations.The pipework above the roofline is twin walled and incorporates an integral condensation drain. Two models are available, the UB34 with an internal diameter of 125mm and the UB35 with an internal diameter of 160mm. Special lower and higher pitch versions are available to order. Features & Benefits Suitable for use with roof pitches between 25 and 45 degrees. Easy to install Designed for systems that require a low resistance terminal Product Specification Material: Polyethylene Roof Finish: Slated pitched roofs. Free vent area: 20,000mm2. Air flow resistance: <1.0 pascal at 225m3/h.