Hambleside Roof Vent for Marley Ludlow Plus/Redland 49 - Grey HD TV10/6 tile vent Compatible with: Marley Ludlow plus type. Redland 49 type. Sandtoft standard pattern type. Description Designed for use with the most popular tile profiles, the HD TV10 range provide attractive but discreet ventilation entry through the roof surface. The plain vent is designed to simply replace a single tile and maintain a flush fitting appearance to the roofline whether used at high or low level. Actual ventilation area 10,000mm. A large spigot area directly below the ventilation louvres allows for clear air paths and creates less back pressure on any extractor fans/systems connected. Additional adapters are available and can be fully utilised for both mechanical extraction and soil pipe ventilation. Internal weathering protection is designed to maintain free airflow whilst channelling any water ingress out of the vent and on to the roof covering. Manufactured from polypropylene for durability and thermal stability, all vents have a non-reflective surface and are UV stabilised to prevent embrittlement over time. The standard through-colour range consists of Terracotta, Brown, Grey and Antique Red. Other specific colours are available to order.  Minimum rafter pitch: 22.5. Fully assessed by BCL (Birmingham City Laboratories) and approved by Birmingham City Council as suitable for use on any of their housing projects as they met the highest standards for: Actual airflow dimension criteria. Thermal shock. Freeze-thaw cycles from -20 degrees C. Inclined water ingress.