Plain roof tile vent to enable ventilation directly into a roof space or connect to a ducted ventilation system Uses: On roofs with Plain 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 35° Free ventilation area of 7,000mm2. Satisfies all relevant NHBC requirements Compatibility. Plain tiles from all major manufacturers including: Redland Rosemary, Marley Plain, Russell Traditional Plain, Sandtoft Humber Plain