Yes, 90-degree bends can be fitted with our condensing boilers if the correct allowance is made on the maximum flue length. We recommend a 1.3 metre reduction for each 90-degree bend and a 0.9 metre reduction for each 45-degree bend.
If it is necessary to use a 90-degree bend in a vertical flue system, the flue above it should be sloped towards the boiler to ensure that all condensate is allowed to drain from the flue. The slope must be a minimum of 25-30 mm per metre.
A flue is a pipe or duct that carries away your boiler’s exhaust gases and safely releases them from your home and into the atmosphere. These exhaust gases are produced when your boiler burns fuel and must be safely directed.