Please note this tile vent is compatible with the Marley Double Roman roof tiles. A discreet interlocking tile vent that is almost invisible from the ground. The vent will be the same size as the tile it is matching. Please note due to production times any orders over 3 vent tiles will be on an estimated lead time of 7 to 10 working days. Features Unique discreet cassette allowing the vent to sit unobtrusively in the roof yet keeping water above the roofline at all times. Factory fitted round felt sleeve which significantly reduces the felt tearing that can occur around rectangular spigots. RV10K Large spigot for roof ventilation. Extraction This product can be converted for extraction with a COA1 adaptor. Ventilation Area 10000mm2. Water Resistance Exceeds all relevant parts of DoE partners in technology programme. Roof Pitches Over 20 Degrees. Note Colour Match Available - Please contact the Sales Office on 01752 692760.