14
Fig. 11 Fig. 12
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. 13
