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Fig. 11
4.6
Using an external fume duct
An external fume duct can be used only if it meets the following requirements:
• Only insulated tubes (double wall) in stainless steel, secured to the building (Fig.9) should be used.
• An inspection area should be created at the base of the duct for performing periodic checks and
maintenance.
• It should be equipped with a windproof chimney cap and observe the distance "d" from the ridge of the
building as described in par. 1.2.
• Fig. 9 shows the solution to be utilised when using external fume ducts.
Fig. 12
Fig. 13
14
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