Harcon In-line Marley Mendip Roof Tile Vent - Colour Match Description 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. 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.