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Example: For a flue run of 8.5mts
Flue run length N = 8.5mts
Minimum insulation required X = N - 1 mts
= 8.5 - 1 = 7.5 mts
Insulation is supplied in lengths of 1000mm.
Initial 300mm from appliance exit may remain uninsulated (Refer image below)
Last 700mm from rooftop termination down may remain uninsulated.
Note: The insulation can be cut to shorter lengths to allow for bends.