Potterton Performa 28i Installation And Servicing Instructions page 21

Wall Thickness
(X)
(X)
Fig. 20
Fig. 21
Wall Thickness
Waste
(X)
Air Duct
Waste
Flue Duct
8.0 Installation
8.6 Fitting The Flue
HORIZONTAL FLUE
1. The standard flue is suitable for lengths
100mm minimum to 1m maximum (measured
from the edge of the flue elbow outlet).
Rear Flue: maximum wall thickness - 900mm
Side Flue: maximum wall thickness - 870mm
2. Locate the flue elbow on the adaptor at the top
of the boiler. Set the elbow to the required
orientation (rear, right or left).
3. Measure the distance from the outside wall
face to the elbow (Fig. 20). This dimension will be
known as 'X'.
4. Taking the air duct, mark dimension 'X' as
shown (Fig. 21). Measure the length of waste
material, and transfer the dimension to the flue
duct (Fig. 21).
IMPORTANT: Check all measurements before
cutting.
5. Remove the waste from both ducts. Ensure
that the cut ends are square and free from burrs.
6. Remove the flue elbow from the adaptor.
7. Insert the flue duct into the air duct and pass
them through the hole in the wall.
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