48 Air/flue pipe installation manual 8000026412_01
Restrictions
Offset (A)
No extension that can be shortened 106 mm
Extension that can be shortened 170 to 430 mm
0.5 m extension only 431 mm
0.5 m extension + extension that can be
shortened
500 to 760 mm
1 m extension only 785 mm
1 m extension + extension that can be
shortened
850 to 1110 mm
not possible 107 to 169 mm
432 to 499 mm
786 to 849 mm
Example of an offset with extension that can be shortened
Required offset (A): 430 mm
B = (430 mm × 1.4142) − 120 mm = 488 mm
C = 430 mm + 150 mm = 580 mm
Example of an offset with extension that can be shortened +
0.5 m extension
Required offset (A): 760 mm
B = (760 mm × 1.4142) −120 mm = 955 mm
C = 760 mm + 150 mm = 910 mm
Length of the air pipe for the extension that can be
shortened = 955 mm − 460 mm = 495 mm
Example of an offset with extension that can be shortened
1 m extension
Required offset (A): 900 mm
B = (900 mm × 1.4142) − 120 mm = 1153 mm
C = 900 mm + 150 = 1050 mm
Length of the air pipe for the extension that can be
shortened = 1153 − 960 mm = 193 mm
5.17.7.3 Calculating the offset dimensions of 87°
elbows (external wall)
A Offset
B Length of the air pipe
C Height
Formula for an offset with extension that can be shortened
B = A − 275 mm
C = (A × 0.0524) + 305 mm
Formula for an offset with extension that can be shortened
+ 0.5 m extension
B = (A × 1.0014) − 275 mm
C = (A × 0.0524) + 305 mm
Length of the air pipe for the extension that can be
shortened = B − 460 mm
Formula for an offset with extension that can be shortened
1 m extension
B = (A × 1.0014) − 275 mm
C = (A × 0.0524) + 305 mm
Length of the air pipe for the extension that can be
shortened = B − 960 mm
Restrictions
Offset (A)
No extension that can be shortened 275 mm
Extension that can be shortened 400 to 760 mm
0.5 m extension only 764 mm
0.5 m extension + extension that can be
shortened
860 to 1220 mm
1 m extension only 1263 mm
1 m extension + extension that can be
shortened
1360 to 1720 mm
not possible 276 to 399 mm
765 to 859 mm
1264 to 1359 mm
Example of an offset with extension that can be shortened
Required offset (A): 500 mm
B = 500 mm − 275 mm = 225 mm
C = (500 mm × 0.0524) + 305 mm = 331 mm
Example of an offset with extension that can be shortened +
0.5 m extension
Required offset (A): 1050 mm
B = (1050 mm × 1.0014) − 275 mm = 776 mm
C = (1050 mm × 0.0524) + 305 mm = 360 mm
Length of the air pipe for the extension that can be
shortened = 776 mm − 460 mm = 316 mm
Example of an offset with extension that can be shortened
1 m extension
Required offset (A): 1650 mm
B = (1650 mm × 1.0014) − 275 mm = 1377 mm
C = (1650 mm × 0.0524) + 305 mm = 391 mm
Length of the air pipe for the extension that can be
shortened = 1377 mm − 960 mm = 417 mm
5.18 Installing the concentric
connection, 60/100 mm diameter, to the
air/flue system for negative pressure
5.18.1 Installation instructions
Set-up example:
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