What is the maximum equivalent length of a boilers flue?
The maximum horizontal equivalent Flue length (after the boiler turret) is 12m for CD Models and 3 meters for HE models. Allow 1.3 meters of Flue length for each 90-degree bend, 0.9 meters of Flue length for each 45-degree bend. The maximum equivalent vertical Flue length is 15 meters for CD models and 6 meters for HE models. 90 degree bends are not to be used. Allow 0.9 meters of Flue for each 45-degree bends.
