To calculate the length of the flue, simply add, for each component you intend to use, the corresponding value indicated in the
column "Length equivalent to m of pipe" in the table in par. 1.14, and check that the resulting sum is equal to or less than the
maximum length indicated in par. 1.15.
Coupling of extension pipes.
To install push-fitting extensions with other elements of the flue, proceed as follows: Couple the pipe or elbow with the male side (smooth)
in the female side (with lip seal) to the end stop on the previously installed element. This will ensure sealing efficiency of the coupling.
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