The CW EFFE system is designed for single chimneys and grouped flues for type C overlapping boilers with combustion circuit fans.
It is the most technologically efficient response to smoke exhaust from methane gas fuelled boilers, with forced flow and airtight combustion chamber.

CW EFFE is made up of two parallel flues, one for combustion gas exhaust and the second for combustion air exhaust.
This chimney guarantees constant insulation thanks to the ventilation system in the lining sleeve which works like a CW ERRE back-ventilation chimney.

Available diameters (mm):
140 - 160 - 180 - 200

1- Wall in contact with smoke, made up of a refractory CW ECO flue.
2 - Insulation layer made up of high density rock wool panels.
3 - Back-ventilation system which, through vents at the base and top of the chimney and sleeve angles, keeps insulation layer properties intact even in the event of refractory flue sweating phenomena.
4 - Flue casing made up of a vibration-compressed reduced concrete sleeve to protect and support the wall in contact with smoke, including a rectangular conduit to supply heat generators with combustion air. 

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