EZ Fit External Flue (green system) for outdoor boilers

EZ Fit External Flue (green system) for outdoor boilers

External vertical and high-level flue systems are optional accessories which have been designed to enable the extension of Grant external module flue which comes as standard on all outdoor modules. The flue system is manufactured from high grade stainless steel.

How do our flues work?

Features & benefits

All of the Grant external modules come with a low-level flue as standard. The green flue system allows for the extension of this flue to provide against pluming nuisance. The flue is available in modular form which allows it to cater for most installations. The starter elbow will convert and of Grant external modules to a vertical or high-level conventional flue operation. The starter straight connector will allow any of the Grant modules to discharge at a low level and can be extended horizontally. The stainless-steel flue components are fully insulated the accompanying ‘O’ rings seals and locking bands provide a rigid construction.

  • Suitable for Grant external boilers
  • Maximum vertical flue length - 8 metres
  • Maximum horizontal flue length – 4 metres
  • Starter connections available
  • 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° bends and extensions.


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