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5.3.2 CALCULATING THE EXHAUST SMOKE DUCTING
The following instructions must be taken into account for the path of the chimney:
• Tubes made of AISI Type 316 stainless steel, varnished aluminised steel pipes with a minimum thickness of
1.5 mm, and porcelain pipes with a minimum thickness of 0.5 mm shall be used.
• Flexible pipes are allowed if they meet the specications set out by law (made of stainless steel with a smooth
interior wall), coupling pieces must be at least 50 mm in length.
A table is shown below that contains the limitations for the installation:
LIMITATIONS WITH A PIPE Ø 80 mm
WITH A DOUBLE
WALLED PIPE Ø 100 mm
Horizontal stretches with a minimum incline of 5%
2 m
2 m
Minimum length (obligatory in vertical stretches) 1,5 m 2 m
Maximum length (with two 90° bends) 4,5 m 8 m
The maximum length for a vertically installed duct with a maximum of two 90° bends and a minimum
of horizontal travel (only to pierce the wall, if necessary) has been calculated.
In the event that the installation is dierent to that previously stated, it will be necessary to calculate
the ‘equivalent load loss’ for the installation.
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