Choice And Calculation Of The Duct - LASIAN AUDAX 6 KW User And Installation Manual

5.4.2- CHOICE AND CALCULATION OF THE DUCT

For the chimney route, it must be taken into account the following advices:
Pipes of painted aluminum-clad steel (minimum thickness of 1.5 mm), stainless steel (AISI 316) or enameled steel
(minimum thickness of 0.5 mm) can be used.
Hoses are admitted if they meet the specifications set by law (stainless steel with a smooth inner wall) and male-
female connectors must have a minimum length of 50 mm.
To carry out the flue duct, the ducts to be used may have a nominal diameter between 80 mm and 150 mm, to
choose according to the needs and characteristics of the stove and installation.

In the following table are shown the limitations for the duct diameters more used, considering that the
maximum and minimum lengths are counted from the "T" output of the stove, and it is from there where it
should be increased the diameter of the duct if it is necessary (see fig. 5.6):
Minimum length (mandatory in vertical)
Maximum lenght (with two 90° bends)
For installations more than 1200m above the
sea
Length of horizontal sections with minimum
5% gradient
The maximum length allowed for each diameter has been calculated for ducts installed vertically, with
a maximum of 2 curves of 90º and practically without horizontal section (only for through the wall if it
were necessary).
If the chimney route was different, it would have to calculate the "equivalent load loss" of the
installation, using the table below.
KIND OF ROUTE OR ACCESSORY
90º Bend
45º Bend
Horizontal section
Diagonal section
"T" Accessory
COD. 83119L.01EN
LIMITATIONS WITH Ø 80 mm PIPE
1.5 m
4.5 m
1.100 m
2 m
Connection Ø80>Ø100
Tee
Fig. 5.6
LENGTH TO SUBTRACT OF TOTAL ALLOWED
1
0.5
1
0.5
1
19
WITH DOUBLE-
WALLED Ø 100 mm
PIPE
2m
8m
-
2 m
meter
meters
meter
meters
meter
09//2016