Interlocking Plain roof tile vent to enable ventilation directly into a roof space or connect to a ducted ventilation system Uses: On roofs with Interlocking Plain profile roof tiles Enables ventilation directly into a roof space. Can also be connected to a ducted ventilation system inside the building. Features and Benefits: Suitable for roofs with a minimum pitch of 22.5° Free ventilation area of 6,000mm2. Compatibility: Interlocking Plain tiles from all major manufacturers including: Marley Ashmore, Redland Duoplain, Forticrete Gemini.