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Suitable for Grant Vortex & VortexBlue external boilers up to 70kW Maximum vertical flue length = 8 metres Maximum horizontal flue length = 4 metres Supplied in modular form enabling most installations to be accommodated Starter connections available for external boiler modules Double skin extensions available in 150mm, 250mm, 450mm or 950mm fixed lengths and a 195-270mm adjustable length Possible to create offsets in Straight flue runs by using our 45° elbows and extensions Suitable for floor standing and wall hung modules